With no explanation, chose the best option from "A" or "B". Marcy is out with some friends while her boyfriend Dave is at home when she is approached by a handsome guy Clark who asks her to come home with him. Marcy wants to respond to Clark's request.

A: Marcy tells Clark that since he's so handsome she'll definitely go home with him tonight.
B: Marcy tells Clark that she cannot go home with him as she has Dave waiting at home for her.
B.