Sentence Correction

Neither First Lady Eleanor Roosevelt nor Secretary of Labor Frances Perkins sought
recognition by the press, and both cautiously allowed others of the Roosevelt brain trust
to take credit for the genesis of historic programs in public employment, relief, and social
security that were in large measure what they had been responsible for.
A. to take credit for the genesis of historic programs in public employment, relief,
and social security that were in large measure what they had been responsible for
B. to take credit for the genesis of historic programs in public employment, relief,
and social security for which the two women were in large measure responsible
C. taking credit for the genesis of historic programs in public employment, relief,
and social security for which the two women were in large measure responsible
D. taking credit for the genesis of historic programs in public employment, relief,
and social security that were in large measure what they were responsible for
E. taking credit for the genesis of historic programs in public employment, relief,
and social security which were largely their responsibility

B IMO

B

A, D, E - can be ruled out because "they" is ambiguous.

B

Is any body having some explanation, plenty of IMO's are already there, I have a few doubts:

I can see inconsistent use of had in A, and a peculiar ending in responsible for, but not that comfortable with wordings of B, large extent responsible, though option B cleverly not uses they and use two women for prenoun issues,

IMO (B).....i took the 2/3 split route "to take" vs. "taking".....'to take' is better than the present participle form - ing. I got A and B

between A and B ......"that were in large measure what they had been responsible for" i felt "A" is bit wordy than "B"

I see many times gmat make us choose between "2 clause" and "one clause" expression. A use 2-clause expression, B 1-clause

so A is wordy

Between A and B, A has major pronoun ambiguity ("they") and also ends in a preposition ("for"). When moving a preposition back into the body of a sentence, "for which" is perfectly correct, but it often sounds odd because that's not what we would say in normal speech.

B is the best answer. A, D and E have a pronoun ambiguity and C is unidiomatic ('allowed' must take the infinitive)

A vs B
In A, they is ambiguous so we eliminate it and choose B.

Also, B clearly refers 'two women' as opposed to 'they' in A.