That's(.)I want to work in your hotel A.that B.what C.why D.which.么么哒

That's(.)I want to work in your hotel A.that B.what C.why D.which.么么哒
That's(.)I want to work in your hotel
A.that B.what C.why D.which.么么哒

That's(.)I want to work in your hotel A.that B.what C.why D.which.么么哒
C,句子中缺少副词,三个选项中只有why能做副词,不懂可以再问.