Which of the following gases are classified as LP gas?

The correct choice identifies butane, ethane, and propane as classified under LP gas, which stands for liquefied petroleum gas. LP gas is primarily composed of propane and butane, and these hydrocarbons are commonly used in various applications, including cooking and heating.

Propane is particularly significant as it can be stored as a liquid under pressure, making it ideal for use in portable applications or as a direct energy source in many residential and commercial settings. Butane, similarly, is another hydrocarbon that shares similar properties with propane and is also used as LP gas.

Ethane, although less common in LP gas usage compared to propane and butane, is structurally similar and is often found in natural gas. It's important to recognize that the other groups of gases listed are not categorized as LP gas; for instance, oxygen, nitrogen, and argon are all gases normally found in the atmosphere rather than being used for fuel, and the other options include gases with distinct industrial or chemical applications that do not fall under the LP gas classification.