Marie wants to buy some sunscreen for under $15. One brand costs $10; the second brand costs $5 for the same level of protection. Marie sees that the active ingredients in the sunscreens are the same, but Marie decides to purchase the first one. Evaluate Marie's decision.

A.
Marie was correct to buy the more expensive sunscreen, because more expensive products can be used for longer.
B.
Marie was correct to buy the more expensive sunscreen, because more expensive products are of a higher quality.
C.
Marie should have purchased the cheaper sunscreen because, except for price, the two were identical.
D.
Marie should have purchased the cheaper sunscreen because she should save money.