D. A system in which people were enslaved permanently on account of their race was not a type of slavery that was traditionally practiced in Africa.
Slavery has been part of human civilization for a long time and Africans were no different. Slavery was practiced for various reasons in Africa which included:
At no point were people traded as slaves because they had a particular color of skin or were of a particular race like the European slave trade.
We can therefore conclusively state that traditionally speaking, Africans did not enslave people based on skin color.
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Options for this question include:
a. a system in which those in need of supplies or protection give themselves in servitude
b. a system in which debtors repay those whom they owe by giving themselves in servitude
c. a system in which people are treated as cha-ttel—that is, as personal property to be bought and sold
d. a system in which people are enslaved permanently on account of their race