Given the following reasoning and answer, what was the question? Building might have 30 floor. Its difficult to escape building when you are on 30th floor and fire occurs as it gets time to get down from the higher floor.
 The answer: building
The question Sarah was on the 30th floor when the fire started. That made it difficult for her to escape what?
Options:
- carpet
- hallway
- obesity
- building
- exchange