With no explanation, chose the best option from "A" or "B". Bill and Matt are talking on the phone when Matt tells Bill that he won't be able to make it to Bill's concert tomorrow. Bill wants to respond to Matt's statement.

A: Bill tells Matt that it's OK if he doesn't come as he's sure there's a good reason, and that there'll be other concerts.
B: Bill tells Matt that the fact he even contemplated not coming is enough to end their friendship and angrily slams down the phone.
A.