Man: Did you advise Bob against smoking？ Woman: Yes, but whatever I say to him goes in one

Man: Did you advise Bob against smoking？ Woman: Yes, but whatever I say to him goes in one ear and out of the other. Question: What does the woman mean？

A．Bob can"t hear very well.

B．Bob never smokes.

C．Bob never listens to her.

D．Bob goes out before she says anything to him.

请帮忙给出正确答案和分析，谢谢！