Q: Fact 1: Avalley is formed by a river flowing. Fact 2: And from the spring there flows a river. Given the two facts above, the output of a spring can eventually form a what?

pick from the following.
a). voltage
b). rain
c). power
d). dormant
e). valley
f). mountain
g). skyscraper
h). goldmine
The answer is:
e).