阅读小对话,回答对话：W:So,did you spend much at the mall,Jim?M:Relax,M

阅读小对话,回答
对话：
W:So,did you spend much at the mall,Jim?
M:Relax,Mom,I bought everything on sale .I only spent 13.50 dollars.
W:Oh,well,that's OK.
Where did the man go just now?
A.a department store B.a supermarket C.a restaurant
A.a department store
请问为什么是选A而不是B呢?