With no explanation, chose the best option from "A" or "B". Dave is on the phone with his friend Phil who invites Dave to a party the next day and asks him to come early to help set up. Dave wants to respond to Phil's invitation.

A: Dave tells Phil he'll come to the party, but he has some other plans beforehand, so he can't help set up.
B: Dave tells Phil he'll definitely come early and help Phil set up and stay for the party.
B.