Concept:The Economic Commission for Africa (ECA) is a regional body created by a major international organisation.Explanation:The ECA was established in 1958 by the United Nations Organization (UNO).Its headquarters is located in Addis Ababa, Ethiopia.The main purpose of the ECA is to promote social and economic development across African countries.Since it operates under the UNO, it is not a body of ECOWAS, OAU, or IMF.Answer:A. UNO