What condition in traditional Africa made it easier for Europeans to trade for slaves on that continent?

Many African societies, such as the Songhai and the Ashanti, used slave labor.

Continual warfare ensured a constant supply of captives to be sold as slaves.

Frequent famines made slavery an alternative to starvation for many people.

Villagers had no individual rights in the medieval African kingdoms.

Question

What condition in traditional Africa made it easier for Europeans to trade for slaves on that continent?

Many African societies, such as the Songhai and the Ashanti, used slave labor.

Continual warfare ensured a constant supply of captives to be sold as slaves.

Frequent famines made slavery an alternative to starvation for many people.

Villagers had no individual rights in the medieval African kingdoms.

beatboxingfetus · Answer

I know that the African people used to trade the Europeans for goods for their own people, and they were slaves too so I would say A.
Anyone have anything to say against it?