一道GWD，在语法区没人回答，希望朋友们帮助

蔻华施

据说annouce后面不加that也是没错的，加that是优选！
GWD中不明白的语法题我都是去记答案！

xlg24127

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.

答案是C  为什么announced后面不用加that呢？

A是唯一有that的，可是they又指代不清

望知道的朋友解释一下，谢谢了！