单项选择题

Jack: How time flies! Another Friday again Susan: Oh, yes. I haven’t realized that. Jack: Do you have any plans for this Saturday afternoon Susan: ______ Why Jack: I’m wondering if you’d like to go to a movie with me. Susan: I’m afraid we’ll have to change the date.

A.I am free for the whole day.
B.I don’t have any plans.
C.I have a prior engagement at three.
D.I’m not quite sure for the moment.