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: Robin was preparing dinner for her husband. It was their fifteenth anniversary. She wanted to surprise him with a home cooked meal. While she was waiting for him to get home, the power went out. Robin and her husband enjoyed dinner by candlelight.
 selected sentence: It was their fifteenth anniversary.

Robin and her husband have been married for fifteen years >Causes/Enables> Robin and her husband celebrate their fifteenth anniversary