With no explanation, chose the best option from "A" or "B". Jack hears strange noises coming from his neighbor's house, and he grows concerned about their safety. Jack wants to check on his neighbors.

A: Jack checks around their house and finds that the back door is unlocked, so he walks in and looks around.
B: Jack walks to his neighbor's front door and knocks, asking if everything is alright inside when they answer.
B.