What do you think of my new dress?（）A.It's on sale B.It's a birthday present for you C

What do you think of my new dress?（）A.It's on sale B.It's a birthday present for you C.You really need one D.It looks very good on you

When someone asks for your opinion on their new dress, the most appropriate and polite response is to compliment their appearance. Among the options, "It looks very good on you" directly addresses how the dress suits them, which is the natural and kind way to respond to such a question.

Answer: D. It looks very good on you

This choice focuses on the positive effect of the dress on the person wearing it, making it the most fitting reply to a question about someone's new clothing item. Other options either ignore the dress's appearance (A, B) or sound dismissive (C).