The fossil fuel among the options provided is coal. Coal is a combustible black or brownish-black sedimentary rock that is primarily composed of carbon. It is formed from the remains of ancient plants and organisms that lived millions of years ago. To determine this, you can examine the characteristics of each option and identify which one fits the definition of a fossil fuel. As wind and solar energy are renewable sources, they are not considered fossil fuels. Hydro refers to hydroelectric power, which is generated from the energy of moving water and is also not a fossil fuel.
