20. A customer is calling for the manager who is not immediately available. Which of the following responses will leave the MOST positive impression on the customer?

A. "I don't know where the manager is. Can you call back in a couple of hours?"
B. "The manager is with another customer. May I help you, or should I have him call you when he is available?"
C. "I think the manager is still having coffee. I'll have him call you when he's available."
D. "The manager is at the doctor's office. He said that he'd return all calls later in the day or tomorrow."