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Here is a detailed explanation to this question-
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By attracting such prominent writers as Ernest Hemingway, Thornton Wilder, Ezra Pound, and acting as a meeting place for so many other Left Bank artists, Gertrude Stein's salon at 27 Rue de Fleurus gained a permanent place in literary history.
A)Ezra Pound, and acting
B)Ezra Pound, and by acting
C)and Ezra Pound, and by acting
D)and Ezra Pound, acting
E)and Ezra Pound, and acting
A: This answer choice fails to connect "Ezra Pound", the final element of a list, with the rest of the list with the word "and"; the correct form of the oxford comma, used to connect the final element of a list, is "and + comma". Thus, this answer choice is incorrect.
B: This answer choice repeats the error seen in Option A. Thus, this answer choice is incorrect.
C: This answer choice conveys the intended meaning of the sentence, correctly utilizes the oxford comma, and maintains parallelism. Thus, this answer choice is correct.
D: This answer choice incorrectly modifies the noun "Ezra Pound", rather than the noun "Gertrude Stein's salon", with the phrase "acting as a meeting place...".Thus, this answer choice is incorrect.
E: This answer choice fails to maintain parallelism between the verbs "By attracting" and "acting"; as the first two clauses of this sentence are dependent clauses, "By" will not automatically apply to the verb "acting" because "acting" is a part of the second dependent clause. Thus, this answer choice is incorrect.
Hence, C is the best answer choice.To understand the concept of "Oxford Comma on GMAT", you may want to watch the following video (~2 minutes):
All the best!
Experts' Global Team