---Happy birthday to you ! .
---Thank you, I certainly will.
A. The same to you
B. Thank you
C. Give my best wishes to your mother
D. It’s nice of you
网友回答
A. The same to you
B. Thank you
(答案→)C. Give my best wishes to your mother
D. It’s nice of you
解析：考察交际用语.四个选项分别表示同样的祝福给你、谢谢你、向你母亲送上我最好的祝福和你太好了。根据题意，祝你生日快乐！向你母亲送上我最好的祝福。——谢谢你，我一定会。选C。