Fact 1: Wind is used for producing electricity. Fact 2: Differential heating of air produces wind. Given the two facts above, differential heating of air can be harnessed for what?

Options are: (I) Animal survival; (II) direct energy; (III) reducing acid rain; (IV) Movement of an air mass; (V) heat energy; (VI) running and lifting; (VII) electricity production; (VIII) faster movement;
Answer:
(VII)