根据各组对话内容，从下面方框里提供的5个选项中选出最佳选项

A: I’m sorry to have kept you waiting for so long.B: （） I’ve been killing time by listening to music.

A．Sure. What is it

B．It’s very nice of you to say so.

C．It’s nothing.

D．Have a nice trip!

E．Certainly. Here you are.