Which of the following is an example of conventional energy source?

Fossil Fuels

The correct answer is Option (3) → Fossil Fuels

Option 1: Solar Energy. Incorrect. Solar is a non-conventional (renewable) energy source.

Option 2: Geothermal Energy. Incorrect. Geothermal is also a non-conventional energy source.

Option 3: Fossil Fuels. Correct. Fossil fuels such as coal, petroleum, and natural gas are traditional conventional energy sources, widely used for decades.

Option 4: Wind Energy. Incorrect. Wind is a non-conventional (renewable) energy source.