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: The students heard the fire alarm. They were worried, but their teacher calmly lined them up at the door. They were led into a field. The students learned that the fire alarms was just a drill exercise. The students were relieved as they returned to class.
 selected sentence: They were worried, but their teacher calmly lined them up at the door.

The students hear the fire alarm >Causes/Enables> They line up at the door