Answer: D
Step-by-step explanation:
Slavery was part of Africa, just like it was part of Roman empire. The key unique thing about African slavery was that they were not the chattel slaves. They were provided with certain rights. Later when the Atlantic and Arab slave started the Africa became a major source of scales. Debt slavery, Military slavery, Slavery of war captives were forms of slavery in Africa. Slavery for Domestic and court purposes were most widespread. They were well treated.In larger African states slaves worked in the state administration, and could be an important royal official. Generally people from other ethnic groups were enslaved.