GMAT Sentence Correction (SC) | Re: RAGCT Day 19: So heavy were the storm’s rains and hailstones

So heavy were the storm’s rains and hailstones,and its gusts of gale-force wind were relentless, the city took nearly a decade to recover from the monumental hurricane that affected not just a region, but an entire nation.

(A) and its gusts of gale-force wind were relentless,

(B) and the gale-force wind gusts were relentless, so that

(C) its gusts of gale-force wind relentless, that

(D) the gale-force winds were gusting so relentlessly,

(E)so relentless its gusts of gale-force wind, that
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