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: Ana wanted a healthy lunch for school. She decided to make herself some celery sticks with peanut butter. But when lunch time came, she got a surprise. She hadn't packed them well and now they were sticky and messy! Ana was barely even able to eat her healthy lunch!
 selected sentence: But when lunch time came, she got a surprise.

Ana packed celery sticks and peanut butter in her lunchbox >Causes/Enables> Ana got a surprise at lunchtime