Q: Which of these sentences doesn't make sense?
Options:
- Sentence A: "Working overtime is common and not that serious."
- Sentence B: "Working overtime is not a rational and healthy lifestyle."

Let's solve this gradually.

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
Working overtime results in great pressure and serious health problems. The answer is Sentence A.