Bio gas is primarily a mixture of methane (CH₄) and inert carbon dioxide gas (CO₂). However the name 'biogas' gathers a large variety of gases resulting from specific treatment processes, starting from various organic waste - industries, animal or domestic origin waste, etc.

Correct Option: C

Bio gas is primarily a mixture of methane (CH₄) and inert carbon dioxide gas (CO₂). However the name 'biogas' gathers a large variety of gases resulting from specific treatment processes, starting from various organic waste - industries, animal or domestic origin waste, etc.