根据对话内容，从方框里的选项中选出正确答案。

Mike: Hello, Bill.

Bill: I lost my bag.

Mike:

Bill: I lost it in the playground.

Mike:

Bill: It's black.

Mike: What's in it?

Bill:

Mike: Oh, Look! I found a bag in the playground just now(刚才). Is it your bag?

Bill: Thank you very much.

Mike: You are welcome.

A. Yes, it is. B. What colour is it? C. Where did you lose it? D. My new books and pens. E. What's the matter with you?