A、He knows more customers than any other employees. B、Only he knows how to get a certain large contract. C、He used to be a manag

W: Come in, come in. Have a seat. Ah-Ah-I want you to know this is going to hurt me more than it will hurt you.
M: Yes, ma’am. But I’m not quite sure what you’re talking about.
W: You’re fired. That’s what I’m talking about.
M: (13) I find that surprising, Miss Jackson. After all, I sold twenty-five percent more of our products than any other salesman.（男士对自己被解雇感到很吃惊，因为他销售他们公司的产品比其他推销员要多25%。）
W: Look, I’m not here to argue. You’re fired. Understand?
M: I understand perfectly. (14) I just wonder what’s going to happen to the contract I’ve been arranging. It would be a shame to lose it; it could mean a lot to our company. And I’m the only one who knows the details.（男士想知道他正在谈的那些合同怎么办，他是唯一知道细节的人，而且这些合同对公司意义很大。所以他认为他不应该被开除。）
W: No one is indispensable. Just clear out your desk, and that’s the end of it. (15) Do I make myself clear, Mr. Westlake?
M: Crystal clear — apart from one small detail.
W: And what, pray tell, is that detail?
M: (15) I’m not Mr. Westlake. I’m Carl Smith.（女士要开除的人是Mr. Westlake，但是她正在对话的人是Carl Smith，可见她差点解雇错人。）
W: Oh...well then, that’s a different kettle of fish, Mr. Smith. I know you’ve been working late almost every night and coming in on Sundays to get your work done. The company is very happy with your progress.
M: That’s good to know. I was beginning to think that I wasn’t appreciated.
W: You are doing well. We have approved your first salary increase.
M: That’s great! Thank you! I’ll certainly try to live up to the trust you have demonstrated in me with this raise in pay.
Questions 13 to 15 are based on the conversation you have just heard.
13. Why is the man surprised at being fired?
14. What is the second reason mentioned for the man to object to his being fired?
15. What mistake did the woman make?