A、In a store. B、In a library. C、At school. D、In a hospital. A女士问男士在哪里能买到文具，男士表示可以看一下购物指南，然后又提到文具可以在一层买到。由此推断，对话最有可能发生在商店里。

W: How old is Jerry?
M: He’s 21. He’s a year older than Tom, but he looks younger.
Q: How old is Tom?

W: Where can I buy some stationery?
M: Let’s look at the shopping guide. Oh, it’s on the ground floor.
Q: Where does this dialogue most probably take place?