A、A traffic guard. B、A sociologist. C、A student. D、A salesperson. C暗示与推理题。本题的关键词是textbook，由此可知正确答案为C。

M: I have this camera here that I bought about 12 months ago. But it suddenly doesn’t work.
W: Let me have a look at your sales slip, I am sorry, sir. Your warranty’s expired.
Q: What does the woman mean?

W: I’m looking for a textbook for my sociology course, It’s called American Society at the Crossroads. Do you have it?
M: Yes, we do. You’ll find it in section 24, on the top shelf.
Q: What’s the woman’s occupation probably?