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: Mark had to make a movie for his film class. He asked three of his friends to come act in his film. The day of the shoot, Mark went to the location. He waited for his friends, but no one showed up. Mark was sad that he could not make his film.
 selected sentence: Mark was sad that he could not make his film.

Mark's friends don't show up to act in Mark's film >Causes/Enables> Mark can't make his film