Wind energy is plentiful in regions with vast, open spaces. It is a non-polluting, renewable resource. What could be an economic factor that makes the use of this resource less feasible than non-renewable resources, even in such regions?

A) Wind farms cannot be used to generate electricity.
B) Wind farms cannot operate at night due to the lack of winds.
C) Wind farms run on electricity, which is an expensive commodity.
D) Wind farms occupy a lot of land, which is an expensive commodity.