Which are examples of biofuels?

• A. Gasoline, diesel, jet fuel, kerosene
• B. Coal, oil shale, tar sands, natural gas
• C. Firewood, dung, peat, maure
• D. Nuclear, uranium, plutonium, thorium

Answer: (C)

Biofuels come from biomass—the organic matter produced by living organisms—and store energy captured from the sun. They are fuels derived from recently living material and can be renewable when managed sustainably. Firewood, dung, peat, and manure fit this category because each originates from living or once-living matter and can be burned to release energy. In contrast, gasoline, diesel, jet fuel, and kerosene are refined from petroleum, a fossil fuel formed from ancient organisms. Coal, oil shale, tar sands, and natural gas are also fossil energy sources, not biomass. Nuclear fuels like uranium, plutonium, and thorium release energy through nuclear reactions, not the burning of organic matter. So the group with firewood, dung, peat, and manure is the biofuel example.