Within a 24-hour period, a service member shall not drive more than a total of how many hours?

The correct answer is based on regulations regarding driving hours for service members to ensure safety and reduce fatigue. Within a 24-hour period, service members are limited to a total of 10 hours of driving. This regulation is designed to prevent accidents and ensure that personnel are fit for duty, as fatigue can significantly impair driving performance.

Limiting the driving hours to 10 helps maintain the effectiveness and safety of service members on duty, especially when conducting operations that require alertness and precision. It's essential for maintaining operational readiness and protecting both the service members and the public.

Other options provide more or fewer hours than the designated limit, which does not align with these safety regulations. Therefore, 10 hours reflects the required standard for driving limits within a single day for service members.