Joan was a baby, so there were many things she couldn't do, which caused problems for her parents. Name one thing that makes raising a baby difficult.
Options:
- arrive early
- learn to walk
- boy or girl
- bring joy
- talk nonsense
Please answer and provide answer explanation.

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
Babies are young people who have not yet learnt to speak. People who have not yet learnt to speak, speak nonsense. The final answer: talk nonsense.