The United States will be affected by whether Taiwan develops a closer relationship with mainland China or preserves the status quo, since the island nation is the United States' seventh-largest trading partner.
The United States will be affected by whether Taiwan develops a closer relationship with mainland China or preserves the status quo
Whether or not Taiwan develops a closer relationship with mainland China or preserves the status quo affecting the United States
Whether or not Taiwan develops a closer relationship with mainland China or the status quo is preserved, it will affect the United States
It affects the United States whether Taiwan will develop a closer relationship with mainland China or preserves the status quo
It affects the United States whether or not Taiwan will develop a closer relationship with mainland China or preserve the status quo
B:
- sentence fragment (there's no main subject, and/or no main verb: the whole thing is one big whether X or Y construction, which can't stand alone as a sentence)
- 'whether or not' is wordy (yes, that's enough to kill this answer choice all by itself) on the GMAT, whether or not is considered redundant.
Eliminate B, C and E.
- change in meaning: the way this is written, it's the status quo that is affecting the U.S., whereas the sentence is supposed to say that the decision (whether Taiwan will do blah blah blah) is what will affect the U.S.
D:
- the pronoun 'it' doesn't have an antecedent. there are certain idiomatic constructions in which a standalone 'it' is allowed (such as 'make it difficult to...'), but this isn't one of them.
- bad parallelism: 'will develop' is in the future tense, but 'preserves' is in the present tense. as they are alternatives in a decision, these must be presented in the same tense.
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