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: A little baby started to scratch his face. The parents bought him some mittens. They put them on the baby. The baby couldn't scratch his face. The parents were happy.
 selected sentence: The parents bought him some mittens.

A Baby scratches his face >Causes/Enables> Parents buy mittens