Clark, a Fellow Salesperson, Has Become Very Frustrated by His

Clark, a fellow salesperson, has become very frustrated by his inability to handle customer complaints. "Frankly, I don't know what to do when a customer starts telling me about a problem," he says. You should advise Clark to:

A) adopt an antagonistic attitude
B) assume the problem is the customer's fault
C) show he is happy that the customer has told him about the problem
D) take control of the conversation and offer a fair solution as soon as he has an idea what the difficulty is
E) do none of the above