How old are you? — 英语情景题

情景对话：今天是 Sam 的生日。请选择合适的句子把对话补充完整（把答案写在横线上）。备选句子：A. Happy birthday! B. I'm nine. C. How old are you? Lily: (1)________, Sam! Sam: Thank you, Lily! Lily: Look! A gift for you. Sam: Wow! Thank you. Lily: (2)________, Sam? Sam: (3)________.