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: Eric watched the storm from his back porch. It was thundering and lightning more than he had ever seen before. All of a sudden a bolt of lightning hit a tree about 50 yards away. There was a loud crack. The big limbs at the top of the tree came crashing to the ground.
 selected sentence: All of a sudden a bolt of lightning hit a tree about 50 yards away.

A storm occurs >Causes/Enables> Lightning hits a tree