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: Callie couldn't figure out how the open the door. Her lock was new and weird so she called me for help. I told Callie how to unlock the door and she was extremely grateful. Later that day Callie got stuck again! She called me up and I changed the locks for her.
 selected sentence: I told Callie how to unlock the door and she was extremely grateful.

Callie called me for help >Causes/Enables> I told Callie how to unlock the door