Which gas is the major component of biogas?

Correct option is B

Methane is the major component of biogas.
Biogas is produced through the anaerobic digestion of organic materials and consists mainly of methane and carbon dioxide.
Biogas:
50-75% Methane (CH4): The fuel source.
25-50% Carbon Dioxide (CO2): Not a fuel, but can be captured.
Rest: Nitrogen, trace Hydrogen sulfide (removed for safety), and water vapor (may be removed).
CNG (Compressed Natural Gas):
Primarily composed of methane (CH4), typically accounting for 50-70% of its volume.
Other components include ethane (C2H6), propane (C3H8), carbon dioxide (CO2), and nitrogen (N2) in smaller quantities. The exact percentage of these can vary depending on the source of the natural gas.
LPG (Liquefied Petroleum Gas):
A mixture of various hydrocarbon gases, primarily:
Propane (C3H8): Usually the major constituent, ranging from 40% to 60%.
Butane (C4H10): Another significant component, accounting for 30% to 50%.