Firstly, GMAT prefers the subject to be at the beginning of the Sentence. Therefore you should look for sentence that does exactly that. That leaves us D and E. E is wrong because which at the end of the sentence modifies Dollar.
C uses
It, which does not have a clear referent. Also, it completely destroys the parallelism. Ideally moment you spot a list check the answer choices that maintain parallelism, it will help you eliminate the wrong answer choices.
Another mistake people make is that when the idiom used is
Both X and Y, sentence should only have 2 items i.e.
Both X,Y, and Z is wrong. It’s a trick used my Question framers.
First, using ‘
which forced’ in not right here; it should be ‘forcing’. This let us to eliminate A, B, E.
For D and C, watch for || in 'both… and…' construction.
C: ‘both because it was weakened by concern… and by growing fears’ is wrong; it should be ‘‘both because … and because…’
Both because it was X and Y (wrong)
Because it was both X and Y (correct)
So, option C can be eliminated.
D: ‘weakened both by concern… and by growing fears’ – clearly ||, so this is the answer.
the parallel elements are "by concern" and "by fears".
"fears" is modified by the adjective "growing", but that is irrelevant; the inclusion of additional modifiers/adjectives/adverbs does not affect parallelism.