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: Robby stopped at a gas station in a small town. There was no one in the store that he saw working. Robby looked around the store. He saw an old man passed out on the floor. Robby called an ambulance to help the man.
 selected sentence: Robby stopped at a gas station in a small town.

Robby drives a car >Causes/Enables> Robby stopped at a gas station