Sentence Correction

[BTGmoderatorRO]

During the 1980s it became clear that soliciting private funds was far more efficient for environmentalists who sought financial aid than to go to state or federal agencies.

(A) that soliciting private funds was far more efficient for environmentalists who sought financial aid
(B) that for environmentalists who sought financial aid, it was far more efficient to solicit private funds
(C) that for environmentalists seeking financial aid, private organizations were far more efficient to go to
(D) for environmentalists seeking financial aid, going to private organizations was far more efficient
(E) for environmentalists who sought financial aid, private organizations were far more efficient

OA is B

Pls, I would like an expert to give an analogical approach to solve this question and the parallelism. This would be deeply appreciated.