Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "The two children threw a ball back and forth."
- Sentence B: "The two children threw a knife back and forth."
 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
They would likely hurt themselves if they threw a knife back and forth.
The final answer: Sentence B.