Concept:Successful economic integration requires member countries to cooperate, but major differences in their levels of development create serious challenges.
Explanation:West African countries have different levels of industrialisation, wealth, and infrastructure.
Some nations are more developed and economically stronger than others.
This uneven development leads to unequal gains from integration.
Wealthier countries may benefit more, while poorer ones may struggle to compete.
It also makes it hard to agree on common policies for trade, tariffs, and movement of goods and people.
Thus, the imbalance in development is a key obstacle to regional economic unity in West Africa.
Answer:B. uneven development among West African countries