The chief constituent of natural gas is methane. Methane is a colorless, odorless, and flammable gas that is found in nature. It is the simplest hydrocarbon and is the main component of natural gas. Methane is also produced by the decomposition of organic matter, such as plants and animals. It is used as a fuel for heating, cooking, and generating electricity.
Butane is a colorless, flammable gas that is found in natural gas and petroleum. It is used as a fuel for heating, cooking, and generating electricity. It is also used in the production of plastics and other chemicals.
Acetylene is a colorless, flammable gas that is used in welding and cutting. It is also used in the production of plastics and other chemicals.
Carbon dioxide is a colorless, odorless, and non-flammable gas that is found in the atmosphere. It is produced by the respiration of animals and the burning of fossil fuels. It is also used in the production of carbonated beverages and dry ice.
Therefore, the correct answer is A.