Concept:Intergroup relations in pre-colonial Nigeria were driven mainly by the need for economic survival and exchange.
Explanation:In pre-colonial Nigeria, different communities produced different goods and resources, such as food, tools, salt, and craft items.
No community was completely self-sufficient, so they engaged in trade and exchange with neighbouring groups.
This economic interdependence created regular contact, cooperation, and mutual dependence among groups.
Though marriage, military alliances, and political ties existed, they were less consistent than trade as a primary cause of intergroup contact.
Answer:A. economic interdependence