Trans World Entertainment Corporation, which owns the Record Town and Saturday Matinee retail chains, announced that since sales of up to one-fourth of its stores are poor, they will be closed.

A.     that since sales of up to one-fourth of its stores are poor, they will be closed.

B.     it is closing up to one-fourth of its stores, which accounted for its poor sales

C.    it was closing up to one fourth of its stores because of poor sales.

D. to be closing, on account of poor sales, up to one-fourth of its stores.

E.    having poor sales, such that up to one-fourth of its stores will be closed.

为什么答案是C？