What did the early river valley civilizations have in common? A. They had nearby rivers that were good for farming but made trade difficult. B. They built cities along rivers that rarely flooded. C. Their rivers provided defensive barriers against invasion. D. Their rivers meant that they could irrigate their crops. Thanks so much!! xx

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.

D

Explanation: A is incorrect because the rivers were good for farming and made trade very easy. B is incorrect because the fact that the rivers flooded regularly is the reason the soil was rich enough to grow so many crops, as a matter of fact, the Nile river had such good flooding it was a tradition to celebrate and praise the Nile river by singing songs, holding festivals and bringing peace offerings .C is incorrect because the rivers made it easy for people to travel so it wouldn't make a good defense. The fact that the rivers flooded is what made it easy to grow crops and irrigate them, Mesopotamia achieved this by draining swamp-like lands and building canals.