--- Can you show me Mr. Jaffer’s office please? --- . But I don’t know if he is in at th

问题补充：

--- Can you show me Mr. Jaffer’s office, please?

--- . But I don’t know if he is in at the moment.

A. Thanks

B. Go on

C. Sure

D. You are welcome

答案：

A. Thanks

B. Go on

(答案→)C. Sure

D. You are welcome

解析：从But看出，前面回答应该是肯定的，“当然可以”。