What does a windmill do?
A An energy source using solar power.An energy source using solar power.
B An energy source using fossil fuels.An energy source using fossil fuels.
C An energy source using nuclear power.An energy source using nuclear power.
D A resource existing in an unlimited amount; it will not run out.A resource existing in an unlimited amount; it will not run out.
E A resource existing in a fixed amount; it will run out eventually.