Fact 1: Hydropower requires damming a river. Fact 2: Another source of energy is hydropower. Given the two facts above, what is a source of energy?

pick from the following. i. fossil fuels. ii. cooking. iii. damming a river. iv. sleeping. v. napping. vi. Electrical energy. vii. our nearest star. viii. sunlight.
The answer is:
iii.