Which East African location is represented by the following clues? -The town's merchants handled export trade items such as gold, copper, iron, coconuts, ivory and rhino horn
-rulers sometimes minted gold and copper coins in foreign currencies and the city-state became wealthy from taxes and profits on trade
-The location converted to Islam and their language is a mix of the local language and Arabic

1. Great Zimbabwe
2.Madagascar
3.Solfa
4. Kilwa
Please help!