从方框中选择恰当的选项，补全下面的对话。

A. She's my mum. B. Is he your father? C. Who's that woman? D. He's my teacher. E. Is she your sister?

Ann: Good morning, Peter.

Peter: Guess.

Ann:

Peter: No, she isn't.

Ann: Who's that man?

Peter: No, he isn't.