The correct answer is: B. butane and propane
LPG stands for liquefied petroleum gas. It is a mixture of propane and butane, which are both hydrocarbons. Propane has a boiling point of -42 degrees Celsius, while butane has a boiling point of -0.5 degrees Celsius. This means that both propane and butane are gases at room temperature, but they can be liquefied under pressure.
LPG is used for a variety of purposes, including cooking, heating, and powering vehicles. It is a clean-burning fuel that produces fewer emissions than gasoline or diesel fuel. LPG is also a relatively safe fuel, as it is not flammable in its liquid state.
The other options are incorrect because they do not include both propane and butane. Option A, methane and butane, is incorrect because methane is a gas that is not flammable in its liquid state. Option C, methane and propane, is incorrect because methane is a gas that is not flammable in its liquid state. Option D, ethane and propane, is incorrect because ethane is a gas that is not flammable in its liquid state.