英语好的请进,两道英语选择I want to know if your son will go to the zoo.I

英语好的请进,两道英语选择
I want to know if your son will go to the zoo.If your son does,so___.
A.does he B.he will C.will mine D.does mine
我觉得是C,不十分确定
Do you often listen to ____MP3 player
No.In fact I haven't ___MP3 player.
A.the;a B./;an C.the;an D./;the
是B还是C?为什么?