A school bus driver shall not drive more than ____________ in a work period.

The correct response highlights that a school bus driver is permitted to drive a maximum of 10 hours during a single work period. This regulation is established to ensure safety and to minimize fatigue among drivers, which is critical for maintaining a safe environment for students.

Driving for extended periods can increase the risk of accidents due to driver fatigue; therefore, efficient time management and regulated driving hours contribute to both the driver's well-being and the safety of the passengers. The 10-hour limit takes into account the necessity for breaks and the importance of having drivers who are alert and focused while operating a school bus.

In contrast, other options do not align with the statutory regulations designed for school bus drivers. The limits below or above 10 hours do not provide the appropriate balance between work and rest needed for optimal performance behind the wheel.