A、The man was confused about the date of the appointment. B、The man wants to change the date of the appointment. C、The man is gl

M: I ran into our friend Mark yesterday on the street and he said he hadn’t heard from you for two months.
W: Yes, I know. But I’ve been too busy to phone him.
Q: What can be inferred from the conversation?

W: Hello. This is Dr. Gray’s office. We’re calling to remind you of your 4:15 appointment for your annual check-up tomorrow.
M: Oh, thanks. It’s a good thing you called. I thought it was 4:15 today.
Q: What do we learn from the conversation?