Scientists have Recently Found Evidence that Black Holes—Regions of Space in which Matter is so Concentrated and the Pull of Gravity so Powerful that Nothing, Not Even Light, can Emerge from them

Question: Scientists have recently found evidence that black holes—regions of space in which matter is so concentrated and the pull of gravity so powerful that nothing, not even light, can emerge from them—probably exist at the core of nearly all galaxies and the mass of each black hole is proportional to its host galaxy.

(A) exist at the core of nearly all galaxies and the mass of each black hole is proportional to
(B) exist at the core of nearly all galaxies and that the mass of each black hole is proportional to that of
(C) exist at the core of nearly all galaxies, and that the mass of each black hole is proportional to
(D) exists at the core of nearly all galaxies, and that the mass of each black hole is proportional to that of
(E) exists at the core of nearly all galaxies and the mass of each black hole is proportional to that of

“Scientists have recently found evidence that black holes—regions of space in which matter is so concentrated and the pull of gravity so powerful that nothing, not even light, can emerge from them—probably exist at the core of nearly all galaxies and the mass of each black hole is proportional to its host galaxy.” - is a GMAT sentence correction question. These types of questions contain grammatical errors in the underlined sentence and we have to choose the correct statement from the options. GMAT sentence correction is a part of GMAT verbal.

Answer: B

Explanation:

The given sentence correction question is tested by the given-below rules:

• Parallelism
• Comparison of two elements
• Modifiers

Scientists have recently found evidence that black holes—regions of space in which matter is so concentrated and the pull of gravity so powerful that nothing, not even light, can emerge from them—probably exist at the core of nearly all galaxies and the mass of each black hole is proportional to its host galaxy

(A) This answer fails to keep up the parallelism between "that the black holes...exist at the core of nearly all galaxies" and "the mass of every region is proportional to its host galaxy". Further, it incorrectly compares "the mass of every black hole" to "its host galaxy".
(B) Correct. This answer choice correctly refers to the plural noun "black holes" with the plural verb "exist". Additionally, it correctly compares "the mass of every black hole" with "that (mass) of its host galaxy".
(C) This answer choice incorrectly compares "the mass of every black hole" to "its host galaxy"; please remember, a comparison should always be made between similar things.
(D) This answer choice incorrectly refers to the plural noun "black holes" with the singular verb "exists". Further, Option D incorrectly uses the "comma + conjunction ("and" during this sentence)" construction to affix the dependent clauses "that the black holes...exist at the core of nearly all galaxies" and "that the mass of every part is proportional to its host galaxy"
(E) This answer choice incorrectly refers to the plural noun "black hole" with the singular verb "exists". Further, Option E fails to keep up the parallelism between "that the black holes...exist at the core of nearly all galaxies" and "the mass of every region is proportional to its host galaxy".

Suggested GMAT Sentence Correction Questions

• November is Traditionally the Strongest Month for Sales lof Light Trucks
• According to scholars, the earliest writing was probably not a direct rendering of speech, but was more likely to begin as a separate and distinct symbolic system of communication, and only later merged with spoken language.
• Seldom more than 40 feet wide and 12 feet deep, but it ran 363 miles across the rugged wilderness of upstate New York
• Despite the increasing number of women graduating from law school and passing bar examinations
• The Supreme Court Has Ruled that Public Universities may Collect Student Activity Fees Even with Students' Objections to Particular Activities, So Long as the Groups they Give Money to Will be Chosen Without Regard to their Views.
• In 1923, the Supreme Court declared a minimum wage for women and children in the District of Columbia as unconstitutional, and ruling that it was a form of price-fixing and, as such, an abridgment of the right of contract.
• As an actress and, more importantly, as a teacher of acting, Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including Marlon Brando and Robert De Niro.
• Fossils of the Arm of a Sloth Found in Puerto Rico in 1991, and Dated at 34 Million Years Old, Made it the Earliest known Mammal of the Greater Antilles Island.
• Like the grassy fields and old pastures that the upland sandpiper needs for feeding and nesting when it returns in May after wintering in the Argentine Pampas
• Starfish, With Anywhere from Five to Eight arms, Have a Strong Regenerative Ability, and If One arm is Lost it Quickly Replaces It, Sometimes by the Animal Overcompensating and Growing an Extra One or Two.
• In ancient Thailand, much of the local artisans' creative energy was expended for the creation of Buddha images and when they constructed and decorated the temples that enshrined them
• Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and the sub-languages or dialects within it
• Reporting that one of its many problems had been the recent extended sales slump in women's apparel, the seven-store retailer said it would start a three-month liquidation sale in all of its stores
• Not trusting themselves to choose wisely among the wide array of investment opportunities on the market, stockbrokers are helping many people who turn to them to buy stocks that could be easily bought directly.
• According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is good for cardiac health.
• As criminal activity on the Internet becomes more and more sophisticated, not only are thieves able to divert cash from company bank accounts
• Hurricanes at first begin traveling from east to west, because that direction is the way the prevailing winds in the tropics blow, but they then veer off toward higher latitudes
• Because an oversupply of computer chips has sent prices plunging, the manufacturer has announced that it will cut production by closing its factories for two days a month.
• Elizabeth Barber, the author of both Prehistoric Textiles, a comprehensive work on cloth in the early cultures of the Mediterranean
• Retail sales rose 8/10 of 1 percent in August