Concept:Natural gas is a fossil fuel whose main component is methane (CHâ‚„), a simple hydrocarbon.
Explanation:Natural gas forms from decomposed organic matter under heat and pressure.
It consists mostly of methane, typically over 85% of its volume.
Small amounts of ethane, propane, and butane may be present, but they are not the primary component.
Methane burns more cleanly than coal or oil, producing less pollution and carbon dioxide.
The other options are n-butane, n-octane, and a mixture of these — they are found in LPG or gasoline, not as the main part of natural gas.
Therefore, natural gas is composed primarily of methane.
Answer:A. Methane