Predication/Modification question

IMO A

what is OA

Nope you are wrong (according to Grockit)

Explanation given by them:
“If,” "whether," and "when" are commonly confused terms. “If” should always note a hypothetical situation; "whether" is appropriate when there is an "or not" (either explicitly or implicitly stated). (Note that "when" is only correct on the GMAT when it refers to an actual time.)

Since the situation described in the segment enclosed by commas is, in fact, hypothetical, “if” is appropriate here. And comparing (D) and (E), the two choices that contain “if,” you should notice the variations “alternatively relieved” in choice (D) and “alternative subsidies” in (E). Since we don’t mean to say that they were “alternatively relieved” (as compared to perhaps “traditionally relieved”), (D) must be incorrect. Finally, (E) reads much less awkwardly than does (D).