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's car was running roughly. She took it into the shop for inspection. The mechanic said she needed an oil change. Amy paid him, and he changed the oil. Her car started running smoothly once again!
 selected sentence: Her car started running smoothly once again!

The mechanic changes the oil in her car >Causes/Enables> Her car runs smoothly