单项选择题

Speaker A: There seems to be something wrong with the air-conditioner in our apartment.
Speaker B:______

A.I'm awfully sorry for that. I' 11 see to it right away.
B.I do beg your pardon for the inconvenience.
C.I just don' t know how to apologize for it.
D.It' s not my fault. I feel sorry for it.