Which one of the following gases, released from bio-gas plant is used as a fuel gas?

Correct answer: (c) Methane

Explanation

Biogas is produced by anaerobic decomposition of organic matter and consists mainly of methane and carbon dioxide.

Methane (CH₄) is the combustible component used as fuel for cooking and heating.

Butane, propane and ethane are petroleum-derived gases, not the main biogas fuel.