WIND FARMS-- Many people believe that wind should replace oil and coal as a source of energy for producing electricity. The structures in the picture are windmills with blades that are rotated by the wind. These rotations cause electricity to be produced by generators. That are turned by the windmills.

10( a) The higher the altitude the more slowly windmills rotate at the same wind speed. Which one of the following is the best reason why the blades of windmills rotate More slowly in higher places at the same wind speed? 1. *
1 point
(a) The air is less dense as altitude increases.
(b) The temperature is lower as altitude increases.
(c) Gravity becomes less as altitude increases.
(d) It rains more often as altitude increases.
sucha big Q. but ans plz
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Answer:
A is the correct answer I think ........