With no explanation, chose the best option from "A" or "B". Mark's girlfriend of 4 years, Hannah, has plans to have a girls-night-out tonight with some friends. Mark wants to have confidence Hannah isn't cheating on him.

A: Mark asks Hannah if she promises not to sleep around on him while she's out.
B: Mark realizes Hannah hasn't cheated on him in 4 years and realizes she wouldn't begin to now.
B.