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: Lucy's grandpa had been napping. She was happy when he finally woke up. She asked for a ride to a friends house. He was too hungry to drive her. She sat and watched as he ate his lunch.
 selected sentence: Lucy's grandpa had been napping.

Lucy's grandpa felt tired >Causes/Enables> Lucy's grandpa took a nap