So C and D. D seems correct grammatically (confirm this Mike please) but it is unecessary long and wordy. C is the best.
I'm glad you like the question.
In addition to being too wordy, (D)
also messes up the idiom --- the idiom is simply "both ... and
", and the GMAT doesn't like adding any garnish to this idiom --- choice (D)
has "both ... and also
" --- while that's not grammatically incorrect, it's wordy and redundant, and the GMAT does not like it at all. Furthermore, (C)
has the action words as verbs (reducing, eliminating
), but (D)
has the action words as nouns (reduction, elimination
) --- as a general rule, if an action word appears both in a verb form and a noun form on the GMAT SC, the verb form will be more concise, more direct, and more powerful --- hence, almost always preferable on the GMAT SC. Technically, I guess (D)
is grammatically correct, but there are a few clear signs why it shouldn't be selected as the answer.
Does all this make sense?
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