Marshall:Do you know what Jason’s office phone number is?Pam:I’m

Marshall:Do you know what Jason’s office phone number is?
Pam:I’m sorry.You might want to look it up in the phone book.
Marshall: ( )but it seems that his phone number is UNLISTED.

A、Sure thing,
B、I don’t know,
C、I’ve checked it already,
D、Oh,don’t bother,
【正确答案】:C