The correct answer is: A. Fossil fuels
Natural gas is a fossil fuel formed when ancient prehistoric forests were buried and subjected to intense heat and pressure over millions of years. It is a non-renewable energy source that is composed primarily of methane, but also contains other hydrocarbons such as ethane, propane, and butane. Natural gas is a clean-burning fuel that produces fewer emissions than other fossil fuels, such as coal and oil. It is also a versatile fuel that can be used for a variety of purposes, including heating, cooking, and generating electricity.
Petroleum is a fossil fuel formed from the remains of ancient marine organisms. It is a liquid that is composed primarily of hydrocarbons, but also contains other compounds such as sulfur and nitrogen. Petroleum is a non-renewable energy source that is used to produce a variety of products, including gasoline, diesel fuel, jet fuel, and asphalt.
Gobar gas is a type of biogas that is produced from the decomposition of animal manure. It is a renewable energy source that can be used for cooking, heating, and generating electricity.
LPG is a liquefied petroleum gas that is composed primarily of propane and butane. It is a non-renewable energy source that is used for cooking, heating, and generating electricity.