Tippu Tib, Whose Real Name Was Hamed Bin Mohammed Al-Murjibi

Tippu Tib, whose real name was Hamed bin Mohammed al-Murjibi, spread his control over large parts of Africa near Zanzibar.What was his method of using Africans from the interior to gain vast personal wealth?

A) He had the natives of the interior carry ivory from elephant tusks to the coast to sell and then sold the people who carried the ivory into slavery, also.
B) He pitted the Boers against the British and sold goods to both sides of the warring nations in their conflicts for colonial control of Africa.
C) He helped the Zulus in their fight against the African kingdom of Great Zimbabwe and was rewarded by the winners of that war.
D) He made his fortune by selling Islamic art, religious icons, and books to the new converts of Islam along the Swahili coast and in southern Arabia.
E) He helped the poor and other members of society who needed assistance in the highly competitive economic areas where the rich got richer and poor got poorer.