Where should ASME containers and cylinders not be stored or transported?

The correct choice highlights that ASME (American Society of Mechanical Engineers) containers and propane cylinders should not be stored or transported inside a vehicle. This is primarily due to the safety risks associated with the confinement of propane gas. If a leak were to occur while the containers are inside a vehicle, the accumulation of gas can create a hazardous atmosphere, posing a risk of explosion, fire, or asphyxiation.

In contrast, the other options relate to safety practices that are either acceptable or manageable under proper guidelines. Storing containers inside a building is generally prohibited unless specific ventilation and safety measures are in place to mitigate the risks of gas leaks. Open areas, when properly secured and away from ignition sources, can provide safer conditions for storage. Similarly, keeping containers at ground level reduces the risk associated with lifting heavy objects and makes monitoring for leaks easier.