One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "children should separate from their parents in the crowd"
- Sentence B: "children should stick with their parents in the crowd"
 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
Children should stay with their parents in a crowd to prevent them from becoming lost.
The final answer: Sentence A.