Choose the incorrect statement regarding wind power.

• A
  It is expected to harness wind power to minimum in open space.
• B
  The potential energy content of wind blowing at high altitudes is the source of wind power.
• C
  Wind hitting at the blades of a windmill causes them to rotate. The rotation thus achieved can be utilised further.
• D
  One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator.