Four of the earliest agrarian societies developed in fertile river valleys. Since people had already tamed plants and animals in those areas, societies had a head start. The first of these was in Mesopotamia, where Iraq is today. The land between the Tigris and Euphrates rivers was especially fertile
It depends how far back you are talking about. If you are talking back to the 1700s it would be cotton. If you are talking about a time period even father back than that, sorry, I can't help. Hope this helped.
Answer and Explanation:
Most likely D. Because of where the Amazon Rain Forest is located, and the human settlements tend to be near the coast and that is why the majority of the country is located there.
I could be wrong tho
