What does CNG mean?A. Compressed Natural GasB. Coal Natural GasC. Carbon Natural GasD. Carbon Nitrogen Gas

CNG stands for Compressed Natural Gas. Here’s the breakdown of the answer:

A. Compressed Natural Gas: This is the correct answer. CNG is a fuel that consists primarily of methane (CH₄) and is used in place of gasoline, diesel fuel, and propane. It is stored at high pressure and is often used in vehicles as a cleaner alternative to conventional fossil fuels.

B. Coal Natural Gas: This is incorrect. While natural gas can be found in association with coal beds (in the form of coalbed methane), the term "Coal Natural Gas" is not used.

C. Carbon Natural Gas: This is also incorrect. While natural gas is composed mainly of carbon (in the form of methane), the term "Carbon Natural Gas" is not a recognized term in the energy sector.

D. Carbon Nitrogen Gas: This is incorrect. Natural gas does contain carbon (as methane) but does not contain nitrogen as a significant component.

Summary:
The correct choice is A. Compressed Natural Gas because it accurately describes the type of fuel represented by the acronym CNG.