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: Kim accidentally took her Dad's lunch to school instead of her own. At lunch time she was horrified to see a sardine sandwich! Tom was sitting near her and begged her to trade with him. She accepted not knowing what she was getting. To her surprise it was her favorite peanut butter and Jelly!
 selected sentence: To her surprise it was her favorite peanut butter and Jelly!

Kim didn't know what sandwich >Causes/Enables> Kim was surprised