C. Nuclear Power
Geothermal, hydro, and wind power are all examples of renewable resources. Nuclear power is the only one here listed as non-renewable. Nuclear power is also relatively cleaner and safer compared to other non-renewable resources.
For example, coal, petroleum, and natural gasses are all non-renewable resources that release carbon dioxide and other greenhouse gasses when burned. On the other hand, nuclear power doesn't release any carbon dioxide or greenhouse gasses, because it doesn't rely on the burning of fossil fuels.