Question: Pick which sentence is not logical.
Options:
- Sentence A: "You must invest in a stock portfolio to have a secure retirement financially."
- Sentence B: "You must invest in stock if you want to retire at all."

Please answer this question 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
Retiring and being financially secure does not require investing in a stock portfolio solely. So the answer is Sentence B.