One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "I closed the window when it rained"
- Sentence B: "I opened the window when it rained"
 Let's be accurate as possible. So think first.

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 the window would allow the rain water to get into the house and perhaps damage it.
The final answer: Sentence B.