What type of transport unit is designed for delivering CNG?

The correct choice is the container delivery unit, which is specifically designed for transporting Compressed Natural Gas (CNG). These units have specialized tanks and pressure systems to safely store and deliver CNG at high pressures. Safety is a crucial factor when handling CNG; thus, these delivery units are engineered to meet stringent safety and regulatory standards that are necessary for hazardous materials transport.

Other types of vehicles like standard delivery trucks, electric delivery vehicles, and flatbed trucks lack the necessary infrastructure and safety features required to safely transport CNG. Standard delivery trucks are typically used for conventional cargo without the specialized containment needed for compressed gases. Electric vehicles, while environmentally friendly, are not designed for CNG transport. Flatbed trucks, on the other hand, do not provide the enclosed and controlled environment necessary to safely handle and retain the properties of CNG during transit. All these factors underscore why a container delivery unit is the most appropriate choice for delivering CNG.