Of the below sentences, which one does *not* make sense?
Options:
- Sentence A: "The boy likes swimming in a pool."
- Sentence B: "The boy likes swimming in an ocean."
 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
Swimming in the ocean is too dangerous for the boy.
The final answer: Sentence B.