Unlike the modest and narrowly targeted proposals of the incumbent sen

My Answer is D:

"Unlike the modest and narrowly targeted proposals...." should be followed by the grand campaign promises, to have correct comparison. With this, A and B can be eliminated.
out of C D and E. In C sharing is missing which actually changes the meaning. So,I eliminated C.

Out of D and E, E is wordy with the usage of belied the fact that...so E is out.
Best out of all choices is D

Unlike the modest and narrowly targeted proposals of the incumbent senator, who was running for her third term, the inexperienced candidate made grand campaign promises that belied his preference for idealistic platitudes rather than discussing specific policy changes.

A) the inexperienced candidate made grand campaign promises that belied his preference for idealistic platitudes rather than discussing specific policy changes - wrong comparison Unlike A, B

B) the inexperienced candidate made campaign promises that belied his preference for sharing idealistic platitudes rather than discussing specific policy changes - wrong comparison Unlike A, B

C) the grand campaign promises made by the inexperienced candidate belied his preference for idealistic platitudes rather than discussing specific policy changes - wrong comparison

D) the grand campaign promises made by the inexperienced candidate belied his preference for sharing idealistic platitudes rather than discussing specific policy changes - correct compatison - parallel structure correct -correct answer
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E) the grand campaign promises made by the inexperienced candidate belied the fact that he preferred to be sharing idealistic platitudes rather than discussing specific policy changes

Unlike the modest and narrowly targeted proposals of the incumbent senator, who was running for her third term, the inexperienced candidate made grand campaign promises that belied his preference for idealistic platitudes rather than discussing specific policy changes.

A) the inexperienced candidate made grand campaign promises that belied his preference for idealistic platitudes rather than discussing specific policy changes

B) the inexperienced candidate made campaign promises that belied his preference for sharing idealistic platitudes rather than discussing specific policy changes

C) the grand campaign promises made by the inexperienced candidate belied his preference for idealistic platitudes rather than discussing specific policy changes

D) the grand campaign promises made by the inexperienced candidate belied his preference for sharing idealistic platitudes rather than discussing specific policy changes

E) the grand campaign promises made by the inexperienced candidate belied the fact that he preferred to be sharing idealistic platitudes rather than discussing specific policy changes

Unlike Subject1 + Verb1, Subject2 + Verb2

Subject1 and Subject2 should be comparable.

In option A & B, Subject1 is "PROPOSALS" and Subject2 is "Candidate". Both are not comparable.
In open C,D and E, "Proposals" are compared with "Promises", that is better comparison.

In option A and C, idealistic platitudes rather than discussing specific policy changes--Sharing is missing. it should be "Sharing idealistic platitudes rather than discussing specific policy changes".

Option E, unnecessary usage of words. "belied his preference" is crisp and concise than "belied the fact that he preferred to be "

So option D is better than other options.