One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "You'd better drive fast when it rains heavily."
- Sentence B: "You'd better drive slowly when it rains heavily."
 Let's reason step by step:

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
Speeding up on a rainy day can easily lead to a car accident. Final answer: Sentence A.