In a shopping conversation， which of the following is more often used to bargain？

In a shopping conversation， which of the following is more often used to bargain？
A.What are your opening hours？
B.I’d like to change this for a different size.
C.I like this style， but I don’t care for the color.
D.Can you give me a better deal？
正确答案：Can you give me a better deal？