Concept: Nigeria supported African liberation by helping to form the main continental body against colonialism.Explanation: Nigeria played a leading role in the struggle for decolonisation and the fight against racism in Africa.To achieve this, Nigeria strongly supported the creation of a united continental organisation.This organisation was the Organisation of African Unity (OAU), formed in 1963.Through the OAU, Nigeria and other African states coordinated efforts to end colonial rule and apartheid.Answer: B. Organization of African Unity (OAU)