从方框中选择恰当的选项补全下面的对话。

A．Who's that woman? B．Hello，Alice． C．Yes，she is． D．He is my big brother． E．He is a teacher．

Alice：Hello，Hector．

Hector：

Alice：Who's that man?

Hector：

Alice：Is he a student?

Hector：No，he isn't．

Alice：

Hector：Guess．

Alice：Is she your mother?

Hector：