Read the following conversation and answer the question.

W: Would you mind taking your feet off the desk, Bill?

M: Sorry, but I was very comfortable.

W: But do you put your feet on your own desk?

M: No, never. I don't want to mark my desk.

W: Well, would you please keep my desk clean?

M: Aren't you going to sell it?

W: Yes, but who wants a badly marked one?

Question: Why did the man do so? 

- Because the desk is going to be sold.

- Because it is his own desk.

- Because the desk is not his own.


Because the desk is going to be sold.