根据对话内容，选择适当的一项。（其中有一选项是多余的）

A.It's Amy's. B. Yes, it's very interesting. C. Yes, they are. D. Yes, it is. E. Whose is the green book? F. Which book is yours?

A: Look at these storybooks. Are they all ours?

B: 

A: Whose book is this?

B: 

A: Oh, it's a book about seasons.

B: 

A: 

B: That red book is mine.

A: 

B: It's John's.