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: Amy and her friend were riding bikes on a summer afternoon. They decided to ride to her friend's cousin's house. There was a steep hill which was hard to ride up. Amy was sweating and panting as she rode up the hill. Amy ended up walking the bike up the hill instead of riding.
 selected sentence: There was a steep hill which was hard to ride up.

They ride to their friend's house >Causes/Enables> Amy struggles up a steep hill