单项选择题

While visiting France, we decided to do some shopping. Not far from the hotel was a store with all kinds of clothing hanging up, and a notice offering fifty percent discount.
When we entered the shop, a woman asked if she could help us, but we would like to look a round on our own. She looked at us very strangely.
Not finding anything suitable, we thanked the woman and left. Suddenly my husband began to laugh and pointed to a small sign in English. It said: "DRY-CLEANING SHOP".

The writer and her husband went into the shop because()

A. they want to have their clothes washed
B. they want to buy the clothes they saw in it
C. they didn’t know they went into the dry-cleaning shop
D. they liked the woman in it