Answer:
The correct answer is A) captives in war.
Step-by-step explanation:
Prior to exploration, enslaved people from Africa were often captives in war.
Before the arrival of the conquerors or the European powers that colonized Africa, enslaved people from that territory were captives of war. It was after Portugal, France or Britain came to Africa and during the Scramble for Africa, that these people became slaves and were sold and view as property more than human beings. Slavery became a good business for rich people.