Concept:The OAU was founded on the Pan-African ideal of Africa's unity and collective action.
Explanation:The Organization of African Unity was established in 1963 in Addis Ababa by 32 founding African states.
Its birth was inspired by the Pan-African movement, which stressed that African independence and dignity could only be secured through unity.
Leading founders, such as Kwame Nkrumah, strongly argued that Africa must unite to overcome colonialism, imperialism and racial discrimination.
Options B, C and D describe secondary goals or benefits, not the dominant founding idea.
Therefore, the core idea behind the establishment of the OAU is the political and continental unity of Africa.
Answer:A. That Africa must unite.