Which did the early river valley civilizations have in common? A. The nearby rivers were good for farming but made trade difficu
lt. 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.
Omg I just went over this in class The answer is D! Because it made trading easier not harder It did damage crops with flossing but only some of them and it didn't protect them at all Hope it helped! Btw's this chapter in school can get interesting! : )
