谁可以帮我讲解下这个英语选择题（初中）
-What did he say?
-He said ______
A.he is having a suprise party for you.
B.the earth moves round the sun.
C.why she wanted to do that.
D.if she went to her house.
B.谁可以帮我讲解下,为什么选B呢?