选择合适的选项，补全对话。

Sarah: Amy.

Amy: Good morning, Sarah.

Sarah: She's my grandma.

Amy: Wow! She's so tall.

Sarah: She's my sister.

Amy:

Sarah: Yes, he's my brother, Sam.

Amy:

Sam: Nice to meet you, too.

A. Is he your brother? B. Nice to meet you. C. Good morning, D. Who's that girl? E. Who's that woman?