Concept:ECOWAS is a regional organisation focused on economic cooperation and integration in West Africa.
Explanation:ECOWAS was set up in 1975 by West African countries.
Its main goal is to promote economic growth and development among member states.
It works through regional trade, free movement of people and goods, and joint development projects.
A common currency was planned later, but it is not the primary reason for establishing ECOWAS.
Preventing neo-colonialism and sidelining French-speaking states are not the main objectives.
Therefore, the best option is the one that states the promotion of economic growth and development among member states.
Answer:D. Promote economic growth and development among member states.