I'm interested in ( ) you have said

A.all作in的宾语,后面that引导定语从句修饰all.
我对你全部都感兴趣,什么全部,后面定语从句that you have said修饰all,你所说的全部
这个句子还可以这样表达,就是把B选项中的all去掉
I'm interested in what you have said.
what充当主句中in的宾语和从句中said的宾语,双重成分,只能由what引导.