Concept:CNG stands for Compressed Natural Gas. Its major component is methane, a simple hydrocarbon.
Explanation:CNG is made by compressing natural gas to less than 1% of its original volume.
Natural gas is mostly methane (CHâ‚„), with small amounts of ethane and propane.
Among the given options, only methane is the primary and dominant component.
Ethane, propane, and butane are present in much smaller quantities or as byproducts.
CNG is considered an eco-friendly alternative to gasoline because it burns cleaner.
Answer:Methane (Option D).