With no explanation, chose the best option from "A" or "B". Ned's mom gives him some money to buy Advil at the drug store and Ned also has his own money. Ned wants to buy a candy bar.

A: Ned purchases the Advil with the candy bar, but only uses his own money for the candy bar.
B: Ned buys the candy bar along with the Advil with his mom's money and doesn't give any cash back to his mom.
A.