How to reply when passengers ask FA to help them with their seat?

How to reply when passengers ask FA to help them with their seat?
A.May I see your boarding pass, please?
B.Could I have a look at your boarding card?
C.Of course.
D.I’m afraid I can't.
正确答案：May I see your boarding pass, please?；Could I have a look at your boarding card?；Of course.