Who is making so much noise in the garden?-- the children.A.

Who is making so much noise in the garden?__ the children.A.It is B.They are C.It can't be
D.there are
我看到你回答过这个题.我和他唯一的区别就是C选项不一样.书上给我的答案是A.可是我不明白是为什么