With no explanation, chose the best option from "A" or "B". Mike is on summer vacation and is out and about exploring a new city. Mike is thirsty and wants to get a bottle of water.

A: After Mike buys his bottle of water he realizes that cashier gave him too much change back by mistake but opts to keep it.
B: After Mike buys his bottle of water he realizes that cashier gave him too much change back by mistake and returns it.
B.