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: Tony wanted to decorate his Christmas tree. He went to the attic and got all of the ornaments down. He opened the box and began taking out the ornaments. One by one, he hung all of them on the tree. He finished the tree by placing the star on the top.
 selected sentence: He opened the box and began taking out the ornaments.

Tony grabs an unopened box >Causes/Enables> Tony opens the box