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: Sarah awoke one cold night to a strange noise coming from her window. She got out of bed to go see what it was. As she was walking to the window she saw a small shadow. She opened the curtain and was happily surprised. It was a tiny kitten scratching to get in from the cold.
 selected sentence: She opened the curtain and was happily surprised.

Sarah decides to open >Causes/Enables> Sarah opens