根据对话内容，从下面方框中选出恰当的句子补全对话。

A. About 15. B. Don't worry. C. No, I haven't. D. Why are they moving? E. How can I get more information?

Mark: Hello, Judy. Have you heard the latest news about the elephants?

Judy:  What is it?

Mark: A group of elephants are on their way to the north.

Judy: Oh!  

Mark: Maybe they are looking for a better place to live.

Judy: How many elephants are there in the group?

Mark:   

Judy: Wow! What a big group! But will they hurt people?

Mark:   The government has done a lot to protect people and the elephants.

Judy: That's great news!  

Mark: Let's search on the Internet!