Correct option is D
Biogas is primarily composed of
methane (CH₄) and
carbon dioxide (CO₂). Methane typically constitutes around 50-75% of biogas, with carbon dioxide making up most of the remaining portion. Small amounts of other gases such as hydrogen sulfide (H₂S) and moisture may also be present. Biogas is produced through the anaerobic digestion of organic matter, such as agricultural waste, manure, municipal waste, and sewage, and is used as a renewable energy source for heating, electricity generation, and fuel.
