Which of the following is a mobile unit designed to transport LNG or CNG?

A mobile unit designed to transport LNG or CNG is referred to as a "Cargo Transport Container." This type of unit is specifically engineered to hold and secure liquefied natural gas (LNG) or compressed natural gas (CNG) during transport. Cargo transport containers are built to maintain the necessary pressure and temperature conditions to safely store these gases, preventing leakage and ensuring the integrity of the product throughout its journey.

In contrast, while a fuel delivery truck is indeed used for delivering fuels, it typically does so using containers mounted on the truck rather than serving as the primary transport unit itself. Other choices, like cargo transport vehicles and transport containers, can refer to a variety of vehicles and structures not specifically designed for natural gas transport, and may not possess the specialized features needed for LNG or CNG. Thus, the term "Cargo Transport Container" distinctly identifies a unit crafted for the very purpose of transporting these specific energy resources.