Nina, Pinta, Santa Maria
(Seriously though, Pinata...Santa Claus...come on people writing the questions on the actual test, we're not that stupid XD)
Answer:
The growing world economy.
The answer is A as river valley civilizations relied on rivers as a source of life. River valleys like Egypt, Mesopotamia and Xi, the rivers brought silt and made the soil very fertile, it also brought fresh water and fish to eat. People can also move fast using rivers.
