Q: 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.
story: Stan's class is going on a field trip. They walk to a nearby library. The librarian reads the kids several books. The kids get a chance to pick out their own book. Stan had so much fun on the field trip.
 selected sentence: Stan had so much fun on the field trip.
A:
Stan's class goes to library for field trip >Causes/Enables> Stan has fun on field trip