Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: James invited his friends over to play a new board game. Nobody had played this game before except James. James won all night. His friends were upset so they went home. James realized he should have chosen a game that was fun for everyone.
 selected sentence: James realized he should have chosen a game that was fun for everyone.

James' friends get upset >Causes/Enables> James realizes why they are upset