Concept:The Economic Commission for Africa (ECA) is a regional commission established within the United Nations framework to support African economic development.Explanation:The ECA was created in 1958 by the Economic and Social Council of the United Nations Organization (UNO).It serves as one of the five regional commissions of the UN, focusing on promoting economic and social progress across African countries.Among the given options, ECOWAS, OAU, and IMF are not the bodies that set up the ECA.Therefore, the correct choice is the UNO.Answer:A. UNO