Mark: Hello? Lisa: Hi Mark, it's Lisa. I'm calling to confirm our appointment for tomorrow at 3 PM. Mark: Oh, Lisa! Thanks for calling. Actually, something urgent came up. Would it be possible to reschedule for next week? Lisa: Hmm, let me see... How about Tuesday at 10 AM? Mark: That sounds perfect! Thanks a lot. What can be inferred about Mark's situation?
A) He forgot about the appointment.