听力原文：W: I just read a curious fact. Did you know that people who spend less than ten minutes in a drugstore are five times more likely to make a purchase than those who spend half an hour there？
M: I saw that article, too. But think, if someone runs into a drugstore for ten minutes, it's usually to make a specific purchase.
W: And someone who spends more time there maybe just looking.
M: Exactly. Haven't you ever gone into a store thinking that you'd buy something, and then talk yourself out of it？
W: Yes, I have, especially when I thought I could get it for less elsewhere, or I really didn't need it after all.
M: Exactly. But ff you run into buying something specific and have very little time. You pick it up, pay for it immediately and then leave.
W: That's true. Maybe we should learn a lesson from that. Take your time and you'll spend less money.
M: I doubt ff that would be true in all stores, though. In a department store, for instance, you may see a sweater or something you never intended to buy, and buy it because you have time to look around.
(23)

A druggist's suggestion.
B. An article.
C. An advertisement.
D. A sales clerk's comment.