For how long must a driver keep their driving logs?

Answer: B — At least six months

The requirement for retaining driving logs for at least six months is rooted in compliance with federal and state regulations regarding recording hours of service. This period ensures that there is an adequate record available for inspection by authorities, which may occur during compliance reviews or audits. Keeping driving logs for six months helps maintain accountability and provides a clear history of a driver's on-duty and off-duty hours. This retention period is crucial for ensuring safety on the road, as it helps to prevent driver fatigue by monitoring and managing driving hours effectively. The other options do not align with the required retention period. Logs retained for less than six months would not provide enough historical data for proper oversight, while there is indeed a requirement for log retention, making the option stating there is no requirement inaccurate.