Which condition is necessary for proper cargo loading in a tank?

Answer: B — Compliance with weight and expansion limits

Proper cargo loading in a tank is critically dependent on compliance with weight and expansion limits. When transporting liquids, it is essential to account for both the weight of the liquid being loaded and the expansion of that liquid, especially if temperature variations are anticipated. Overloading a tanker can lead to safety hazards such as tipping over or losing control of the vehicle. Additionally, if the liquid expands due to temperature changes and exceeds the tank's capacity, it can lead to spills or dangerous over-pressurization. The importance of adhering to these limitations ensures not only safety but also regulatory compliance with transportation laws. This includes understanding the tank's design specifications, the type of cargo, and its physical properties to prevent accidents during transport.