With no explanation, chose the best option from "A" or "B". Oliver is shopping at the local grocery store to pick up food for the upcoming week. Oliver wants to stay under the fifty dollar budget he set for himself.

A: Oliver estimates how much his cart costs in his head and decides he'll need to forgo buying any indulgent items this week in order to make his budget.
B: To stay under budget, Oliver hides some premium chocolate bars in his pockets while checking out.
A.