Metal work and animal-drawn plows were essential parts of the development of complex societies in Africa and Eurasia, but not in the Americas. This would indicate which of the following?

(A) The role of religion in economic development (B) The influence of environmental factors in patterns of development (C) That the earliest Americans emphasized warfare at the expense of their own economic development (D) That the earliest Americans depended primarily on trade rather than on agriculture to sustain their economiesExplanation: The Americas lacked horses and oxen, the animals that were most commonly used for agricultural work. And while the indigenous cultures were practiced in decorative metal work (using gold and silver especially), they did not use metals for weaponry. Religion and trade did not play substantial roles in economic development (A, D); warfare, however, did contribute to economic development (C), thanks to the resulting extensive system of tribute.