Concept:ECOWAS aims to promote economic integration among West African states. Removing trade barriers and encouraging free movement of goods are central goals.Explanation:ECOWAS was formed to strengthen regional cooperation and development.Its main objectives include eliminating customs duties and trade restrictions.It also seeks to create a common market for goods, services, and people.Therefore, the most accurate option is the one that refers to fostering the exchange of goods and services.Answer:C. foster exchange of goods and services.