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: Milly's class was visiting a real working farm. They had been promised a tractor ride while they were there. They were all very excited about it. Milly was in the first group to ride on the tractor. It was much louder and bouncier than she expected.
 selected sentence: They had been promised a tractor ride while they were there.

Milly's class goes to the farm >Causes/Enables> Milly's class get promised a tractor ride