单选题 Man: I ran into our friend, Mark, yesterday on the street, and he said he hadn't heard from you for two months.
Woman: Yes, I know. But I've been too busy to phone him.
Question: What can be inferred from the conversation?
A. The man saw Mark on the street two months ago.
B. The woman had forgotten Mark's phone number.
C. The woman made a phone call to Mark yesterday.
D. Mark and the woman had not been in touch for some time.