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: Kate's school had a contest. Whoever could earn the most box tops would win a prize. Kate spent all month finding as many box tops as possible. On the last day of the contest, she turned in her box tops. She ended up winning.
 selected sentence: Whoever could earn the most box tops would win a prize.

Kate's school has a contest >Causes/Enables> Whoever earns the most box tops wins a prize