The answer is; A
Fossil fuels are nonrenewable energy sources. This is because the rate at which they can be used by humans will definitely be higher than the rate at which they are replenished. Fossils fuels are formed over millions of years by sedimented planktons being subjected to enormous pressure and temperatures over long periods of time. Humans consume the fossil are quite fast rates that the source of energy can be depleted in some few hundred years.