What must be inspected to ensure proper functioning of the air brake system in school buses?

Answer: B — Air pressure, brake components, and storage tanks

To ensure the proper functioning of the air brake system in school buses, it is essential to focus on air pressure, brake components, and storage tanks. The air brake system relies on compressed air to operate, making air pressure a critical element. The brake components, such as hoses, valves, and chambers, must be inspected to check for wear, leaks, or damage that could compromise braking effectiveness. Additionally, the storage tanks, which hold the compressed air, need to be examined to prevent moisture buildup and ensure that the air supply is sufficient for safe operation. Inspection of these elements is fundamental in maintaining the integrity and safety of the braking system, as they directly impact the ability of the brakes to function reliably during operation.