Judging from your other questions, I would guess the Aztecs, because they had an extremely advanced civilization relative to their time period. However, you might want a second opinion to verify this. Hope this helps.
Was the main motivation for the Europeans Diamonds
The correct answer is A. It increased the number of enslaved laborers forced to grow crops that were exported from the Americas to Europe.
Explanation:
The Atlantic slave trade implied hundreds of Africans were forcibly taken to American and forced to work as slaves. This practiced was related to the triangular trade, in which, products such as cotton and tobacco were exported to Europe, then manufactured goods were taken to Africa, and slaves were exported to America.
Moreover, due to the need for America to produce raw goods such as cotton or tobacco to contribute to the triangular trade, most of the slaves from Africa were used in plantations. Thus, the Atlantic trade impacted the role of America in the triangular trade because "it increased the number of enslaved laborers forced to grow crops that were exported from the Americas to Europe".