Fact 1: Awindmill converts wind energy into electricity primarily by using mechanical energy. Fact 2: Windmills are machines operated by windpower. Given the two facts above, what converts wind energy into electricity?

Choose from: a. clouds. b. mechanical waves. c. windpower operated machines. d. Movement of an air mass. e. solar panels. f. Warm air moving into cold air. g. batteries. h. tectonic plates being pushed together.
Answer:
c.