主语从句 It is none of your business -------- other people think

主语从句
It is none of your business ________ other people think about you.Believe yourself.
A.how B.what C.which D.when
为什么不能选A呢 哪位高手告诉下怎么回事 昨天在知道问过这个问题,但是有各式各样的回答,有人说选A,也有人说选B.
不知道到底该选A还是B,纠结啊.