What positioning consideration must be taken for the fuel supply container?

The correct response emphasizes the importance of preventing contact between the fuel supply container and vehicle components. This consideration is crucial to avoiding abrasion and potential wear over time, which could lead to leaks or failures. Proper placement ensures that the container is adequately protected from the movement and vibrations that occur during vehicle operation.

Positioning the container in a way that shields it from sharp edges, heat sources, and other potentially damaging elements enhances the overall safety and durability of the vehicle's fuel system. This consideration is especially vital for a compressed natural gas delivery truck, where maintaining the integrity of the fuel supply is directly tied to operational reliability and safety.

Each of the other options does not sufficiently address the necessity of ensuring that the container is safeguarded against wear and damage, which could compromise the system's functionality and safety. Hence, the focus on preventing abrasion and preserving the container's integrity is key to safe and effective CNG delivery operations.