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: Alex's mom was going out of town. She was leaving him with his dad. Dad and Alex helped mom put her things in the car. They drove mom to the airport. Mom gave Alex a big hug and disappeared behind the large sliding door.
 selected sentence: They drove mom to the airport.

Alex's mom was going out of town >Causes/Enables> Alex and his dad drove Alex's mom to the airport