What are the structural components to which vehicle cylinder brackets must be mounted?

The correct choice reflects the essential structural components of a vehicle to which cylinder brackets for compressed natural gas (CNG) systems should be mounted. Specifically, mounting brackets on the body, bed, or frame of the vehicle ensures that the CNG cylinders are securely attached and are able to withstand the stresses of vehicle operation, such as vibrations and dynamic loads.

The body of the vehicle provides a solid point for attachment, as it is designed to support various components during normal use. The bed, commonly found in trucks, offers another secure and stable surface for mounting cylinders since it is also designed to handle heavy loads. The frame is the skeletal structure of the vehicle, engineered for strength and rigidity, making it an ideal choice for mounting heavy components like CNG cylinders, ensuring that they remain safely in place throughout their operational life.

The other options present locations that are generally not suitable for the secure mounting of cylinder brackets due to either their design or material properties, which may not provide the stability required for high-pressure gas cylinders. Therefore, selecting the body, bed, or frame ensures compliance with safety standards and optimal performance for CNG systems.