Option D. the tip that could have helped Ashley with her purchase would be to look for bargains.
Explanation:
A bargain is defined at something bought or offered for sale at a lover value than its original or usual price. The most probable scenario in which Ashley's friend bought the same pair of jeans that Ashley bought, but for almost $20 less is that she found the jeans on sale, after looking for bargains. If Ashley would have looked for bargains or promotions before buying the pair of jeans, she probably could have saved money.