Which of the following is essential for the safety of passengers on a school bus?

Regular maintenance checks are essential for the safety of passengers on a school bus because they ensure that all bus components, including brakes, lights, tires, and emergency equipment, are functioning correctly. This ongoing attention to the vehicle’s operational condition minimizes the risk of mechanical failures or safety hazards while the bus is in use. Proper maintenance directly affects the bus's ability to respond effectively in emergency situations and enhances the overall safety of the transportation provided to students.

While the size of the bus, seating comfort, and even interior decoration are important factors in their own right, they do not directly impact the fundamental safety mechanisms that protect passengers during transit. Regular maintenance is crucial for preventing accidents and ensuring a safe riding experience for everyone on board.