根据对话内容，从方框中选出能填入空白处的最佳答案。

Mei: Hey, Lin. Look at this photo. The girl is very nice. Who is she?

Lin:

Mei: Your English teacher?

Lin: Her name is Mary.

Mei: Mary?

Lin: M- A-R- Y.

Mei:

Lin: Yes, she is. And her English is very good.

Mei: Really(真的吗)? Oh, my English is not good. I need her help.

Lin: Yes. Her telephone number is 251-581.

A. How do you spell it? B. Do you know her telephone number? C. Oh, she is my English teacher. D. What's her name? E. Is she English?