By looking at the map of trade route of Africa, it can easily be concluded that the African trade in the regions like Songhai was done by land, while trade in regions like Mogadishu was done with the help of boats. Therefore, the option D holds true.
What is the significance of African trade?
African trade can be referred to or considered as a trade that is most diverse and has overall an effective trade connectivity to its different centers of trade due to better expansion of networks between traders and merchants.
Centers like Mogadishu were settled on ports, as a result, boat trade became easy and better option for such centers of trade; whereas, the centers like Songhai covered by lands to all sides were well-connected for road transport.
Therefore, the option D holds true and states regarding the significance of African trade.
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