—Do you mind my smoking here?—Look at the sign. It says “No Smoking”.A. You’d better not.

问题补充：

—Do you mind my smoking here?

—Look at the sign. It says “No Smoking”.

A. You’d better not. B. No, I don’t. C. If you like, you can.

答案：

解析：根据答语中的It says “No Smoking” 上面写着禁止吸烟，可知对方反对吸烟，所以选A，句意：你介意我在这吸烟吗？你最好不要吸烟，看这个标记，上面写着禁止吸烟。