What is a nonrenewable energy resource?

A nonrenewable energy resource is defined as a resource that forms very slowly and is finite, which aligns perfectly with the chosen answer. These types of resources, such as fossil fuels (coal, oil, and natural gas) and uranium for nuclear energy, take millions of years to develop. Because they are formed over such long geological time scales, once they are used up, they cannot be replaced within a human timescale, making them limited in availability.

This characteristic distinguishes nonrenewable resources from renewable ones, which can be replenished quickly, such as solar or wind energy. Other options do not accurately reflect the nature of nonrenewable resources, as they either imply an endless supply or a rapid replenishment capability, both of which contradict the fundamental definition of nonrenewable resources.