Which of the following is NOT an example of a fossil fuel?

The identification of the correct answer revolves around defining fossil fuels and contrasting them with alternative energy sources. Gas, coal, and oil are all classified as fossil fuels because they are derived from natural processes involving the decomposition of organic matter over millions of years. These resources are carbon-based and are typically extracted from the earth to be burned for energy, making them integral to global energy systems.

Wind, on the other hand, is not a fossil fuel. It originates from the natural movement of air caused by the uneven heating of Earth's surface by the sun and does not involve the burning of organic materials or the release of carbon emissions when harnessed for energy. This distinction is crucial in discussions about energy sources and their environmental impacts. By understanding that fossil fuels are limited to carbon-based energy sources formed from ancient organisms, one can clearly see why wind does not fit this category.