Sentence Correction

The 151 member governments of the World Bank are expected to increase the bank's funding by $75 billion, though some United States legislators cite an obstacle to congressional passage being the concern that the bank's loans will help foreign producers compete with American businesses.

(A) an obstacle to congressional passage being the concern
(B) a concern as an obstacle to congressional passage
(C) as an obstacle to congressional passage the concern
(D) the concern, an obstacle to congressional passage,
(E) as an obstacle for Congress to pass it the concern

[spoiler]OA: C[/spoiler]

please explain every option.

Thanks.