Sean stared at his door all night. He was scared that he might see it doing what?
Options:
- wall
- window
- opening
- closet
- exit
Let's think carefully first. Step-by-step reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Opening means to move a door or window so as to leave a space allowing access and vision. Sean stared at his door all night. He was scared that he might see it opening. So the final answer is opening.