Didn't you tell Henry about the meeting____ I say to him goes in one ear and out of the other.a.What b.Whatever为什么选B呢,whatever 作为两个句子的主语吗?可是what也行的通啊,求该语法点和例句、谢谢

Didn't you tell Henry about the meeting
____ I say to him goes in one ear and out of the other.
a.What b.Whatever
为什么选B呢,whatever 作为两个句子的主语吗?可是what也行的通啊,求该语法点和例句、谢谢