Under what conditions should LP gas cylinders be stored?

The proper storage conditions for LP gas cylinders focus on safety and the prevention of hazards. Storing cylinders in a well-ventilated area is essential because it allows any potential gas that may leak to dissipate, reducing the risk of explosion or fire. Additionally, keeping cylinders upright ensures that the safety relief valve is functioning as intended, allowing any excess pressure to escape safely. Maintaining distance from heat sources is crucial, as elevated temperatures can increase the pressure inside the cylinders, which could lead to catastrophic failure or leaks.

The other choices do not meet these safety requirements. Storing cylinders in a closed, heated environment can create a dangerous situation by trapping heat and gas, increasing the risk of pressure build-up. Placing cylinders on the ground and near electrical sources increases the risk of sparks igniting a leak, while putting them in a completely sealed unit prevents proper ventilation and could lead to pressure-related accidents. Thus, option B is the only safe recommendation for LP gas cylinder storage.