Which one of the following is not a fossil fuel?

The correct answer is solar energy (or any renewable energy source like wind energy or hydropower, depending on the options).

 Explanation:

Fossil fuels are natural energy sources that are formed from the remains of dead plants and animals buried under the Earth’s surface for millions of years. Examples of fossil fuels include:

• Coal

• Petroleum (crude oil)

• Natural gas

These fuels release energy when burned, but they also cause air pollution and contribute to global warming.

On the other hand, solar energy comes directly from the Sun. It is a renewable energy source because it does not get exhausted and does not cause pollution. Solar energy is used in solar panels to produce electricity or heat.

Therefore, among the options, solar energy is not a fossil fuel because it is a clean and renewable resource.