初二英语（）There are many beautiful coats______in the shop but I

初二英语（）There are many beautiful coats______in the shop but I don't know________..
A.To choose from. ,Which one to choose. B.To choose from. ,To choose from which one.
C.To choose.,Which one to choose from. D.To choose., Which one to choose.
（选A原因是什么?）尽可能详细谢谢