Which best explains the increase in the African slave trade after the fifteenth century?

Responses

the domestication of the camel

the domestication of the camel

the arrival of the Portuguese on the coast of Benin

the arrival of the Portuguese on the coast of Benin

the construction of Great Zimbabwe

the construction of Great Zimbabwe

the arrival of Arab traders on the Swahili coast

The arrival of the Portuguese on the coast of Benin