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.

None of the above options accurately describes what a windmill does. A windmill is a device that uses wind power to generate mechanical energy, which is then converted into electrical energy. It typically consists of large blades or sails that are rotated by the force of the wind, which in turn spins a generator to produce electricity. Therefore, the correct answer is not provided.