GWD26-Q23，答案有误吧？

23. GWD26-Q23

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.

这道GWD答案是C，但是少了一个that吧？我选的D，不对吗？

谢谢楼上的。还有哪位能给个权威的解释？

再顶一下

LONGMAN的解释还有一条，可能有用，

2
to say something, especially something that other people will not like, in a loud and confident way
ￚsynonym state'I'm not going to their party,' Maggie announced.
announce (that) that可以省略
He stood up and announced that he was ready to go.