Answer the following question, with explanation first. One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "Turn the power off when you leave"
- Sentence B: "Turn the power on when you leave"

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
To save energy, you should turn the power off when you leave.
So, the answer is Sentence B.