It's definitely either C) accommodating, or D) none of the above. I think It's D because this is an example of compromise in conflict resolution.
Accommodation: Accommodation involves giving in to the other's wishes or smoothing the choppy waves of a conflict. Accommodation sacrifices one's own goals for the sake of the other person. Accommodators often use phrases like: "Whatever you want is fine with me."
While compromise would have both parties winning in some sense, i.e., going to both movies.