A、He lost a button at work. B、He doesn’t know where he put the calculator. C、He thought he broke something the woman lent him. D

M：I need a stamp for this postcard. It’s going to Arkansas. And also I’d like to send this package．
W: Here is your stamp，but you have to take the package to the next window．
Q：Where does this conversation most probably take place?

M：I’m not quite sure how to put this．But about that calculator you let me use，I dropped it, and now the on button doesn’t light up．
W：Oh! That’s OK．It hasn’t been working right for some time now.
Q：What’s the man’s problem?