Concept:ECOWAS has several genuine achievements, but adopting a single common currency is not yet among them.
Explanation:One major achievement of ECOWAS is the free movement of people, goods, and services across member states.
Another achievement is the establishment of joint development projects that improve transport and energy links in West Africa.
Also, ECOWAS has contributed to peacekeeping and political stability in troubled member countries.
However, the plan to introduce a common currency has not been fully realised.
Therefore, any listed item that refers to a common currency must be considered incorrect.
This means the correct set of achievements excludes that item and includes the other three.
Answer:D. I, III, and IV only