A、A shopper. B、A shop owner. C、Her aunt. C根据回答“这是我姑姑送给我的生日礼物。”可知正确答案为C。

W: What’s the time?
M: Ten past eight.
W: Oh, we have to hurry. The meeting will being in half an hour.
Q: When will the meeting begin?

M: What a beautiful dress!  Where did you buy it?
W: It’s my birthday present from my aunt.
Q: Who gave the girl the dress?