pls help asap - flvs btw

Which of the following best describes the use of a non–renewable resource?

Select one:
a. California has several power plants that use heat from the Earth to generate electricity.
b. In the state of Texas, you can find miles of windmills that are used to generate electricity.
c. Oil is burned to heat water into steam in order to turn turbines that generate electricity.
d. The electronic signs along the highway are run by solar power.