Concept:The Economic Community of West African States (ECOWAS) is a regional group aimed at unifying its member states.Explanation:ECOWAS was established to promote economic co-operation and integration among West African countries.It seeks to accelerate economic growth and development across the region.The ultimate goal is to create a common market and improve the living standards of member states.Among the options provided, this objective is best captured by promoting co-operation and integration.Answer:A. promoting co-operation and integration