A Similarity Between the Early Civilizations of the Americas and Afroeurasia

A similarity between the early civilizations of the Americas and Afroeurasia is that

A) complex civilizations arose in areas of great aridity in both the Americas and Afroeurasia.
B) in both the Americas and Afroeurasia, complex civilizations developed within a few centuries following the introduction of farming.
C) in both the Americas and Afroeurasia, early societies had to struggle against salt contamination in the soil.
D) the institution of slavery played important roles in the early civilizations of both the Americas and Afroeurasia.