İngilizce telefon konuşmaları (Telephone conversations) Test 1

You hear this message on a voicemail:
"Hello, this is Dr. Parker's office calling to confirm your appointment for tomorrow at 10 AM. Please call us back at 555-0187 if you need to reschedule."
What should the listener do if they cannot attend the appointment?

A) Send an email instead
B) Visit the office today
C) Ignore the message
D) Call the provided number