Whereas a Ramjet Generally Cannot Achieve High Speeds Without the Initial Assistance of a Rocket

Question: Whereas a ramjet generally cannot achieve high speeds without the initial assistance of a rocket, high speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce airflow compression at the entrance of the engine and letting air pass through at supersonic speeds.

(A) high speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce
(B) that high speeds can be attained by scramjets, or supersonic combustion ramjets, is a result of their reducing
(C) the ability of scramjets, or supersonic combustion ramjets, to achieve high speeds is because they reduce
(D) scramjets, or supersonic combustion ramjets, have the ability of attaining high speeds when reducing
(E) scramjets, or supersonic combustion ramjets, can attain high speeds by reducing

“Whereas a ramjet generally cannot achieve high speeds without the initial assistance of a rocket, high speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce airflow compression at the entrance of the engine and letting air pass through at supersonic speeds.” - 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: E

Explanation:

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

• Parallelism
• Comparison of two elements
• Modifiers

Whereas a ramjet generally cannot achieve high speeds without the initial assistance of a rocket, high speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce airflow compression at the entrance of the engine and let air pass through at supersonic speeds.

(A) High speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce. The use of the word “can be” attained is not chosen when a more dynamic version of 'can attain' is there in E.
(B) scramjets can attain that high speeds, or supersonic combustion ramjets, is a result of their reducing -- same issue as in A
(C) the ability of scramjets, or supersonic combustion ramjets, to achieve high speeds is because they reduce -- The ability to achieve is inferior as per - V-A-N.
(D) scramjets, or supersonic combustion ramjets, have the ability to attain high speeds when reducing -- have the ability is inferior to can attain as per V-A-N.
(E) This statement is the best fit for the question. This is the correct answer.

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