选择合适的句子完成对话。

A. How old is she? B. Who is this woman? C. Who is he? D. Is this your sister?

Liu Tao: Mike, is this your family photo?

Mike: Yes, it is.

Liu Tao:

Mike: He is my father.

Liu Tao:

Mike: She is my mother.

Liu Tao:

Mike: Yes, she is my sister Helen.

Liu Tao:

Mike: She is nine.