Concept:The secretariat is the permanent administrative headquarters of an international organisation.
Explanation:ECOWAS means the Economic Community of West African States.
It was established by the Treaty of Lagos in
1975.
Although the treaty was signed in Lagos, Nigeria, the secretariat later relocated to Abuja.
Since
1996, the ECOWAS Secretariat has been based in Abuja, Nigeria.
The other options, Accra, Niamey, and Cotonou, are capitals of other West African countries.
These cities host different regional institutions, not the ECOWAS secretariat.
Answer:B. Abuja