The fossil fuel forms over millions of years from the remains of ancient organisms. Thus the correct option is C.
Over millions of years, heat and pressure from earth's crust decomposed these organisms into one of the three main kinds of fuel such as oil (also called petroleum), natural gas, or coal.
These fuels are known as fossil fuels, as they are formed from the remains of dead animals and plants. Today, fossils fuels are necessary for human survival and everyday life and are the primary source for the world’s energy.
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