Sentence Correction

can someone tell me why the wrong answers are wrong? i picked C but its not right

Plausible though it sounds, the weakness of the hypothesis is that it does not incorporate all relevant evidence.
(A) Plausible though it sounds, the weakness of the hypothesis
(B) Even though it sounds plausible, the weakness of the hypothesis
(C) Though plausible, the hypothesis’ weakness
(D) Though the hypothesis sounds plausible, its weakness
(E) The weakness of the hypothesis which sounds plausible

oad

In C because of possessive usage it seems, hypothesis weakness is plausible. incorrect modifier because it is hypothesis which is plausible. Hence D

Plausible though it sounds, the weakness of the hypothesis is that it does not incorporate all relevant evidence.

The second "it" - lacks a clear referant , in choice A , does it refer to the weakness or the hypothesis..

it does not incorporate all relevant evidence clearly refers to the hypothesis and not to the weakness .. of all other choices only D, presents this noun(hypothesis ) as the main noun.

Hence , IMO D.