The Indian Ocean trade involved longer stays at sea than voyages in the Mediterranean Sea.
The city-states traded with inland kingdoms like Great Zimbabwe to obtain gold, ivory, and iron. These materials were then sold to places like India, Southeast Asia, and China. These were Africa's exports in the Indian Ocean Trade. These items could be sold at a profit because they were scarce in Asian countries.
Thus, we can conclude that the correct answer is The Indian Ocean trade involved longer stays at sea than voyages in the Mediterranean Sea.
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