Fossil fuels include coal, oil, and which of the following?

• A. Solar energy
• B. Hydropower
• C. Wind energy
• D. Natural gas

Answer: (D)

Fossil fuels are non-renewable energy sources formed from ancient organic matter that was buried and transformed by heat and pressure over millions of years. The traditional fossil fuels are coal, oil, and natural gas. Natural gas fits this group because it’s a hydrocarbon gas formed underground alongside coal and oil, and it’s used as a major energy source.

The other options are renewable resources: solar energy comes from sunlight, hydropower from moving water, and wind energy from atmospheric motion. They are not fossil fuels because they do not come from ancient fossilized organic matter.