isthebusatoP的前一句(连词成句:bus at the station is the( ))

isthebusatoP的前一句(连词成句:bus at the station is the( ))

Is,this,bus,-----the,station?Yes.选择A.to,B.for,C.by在A和B中纠结,不知选哪一个,请教答......