Concept:The West African Development Bank promotes economic cooperation and development, but it does not regulate international commodity prices.
Explanation:The bank encourages private and public investment in member states.
It also finances and executes development projects across member countries.
It supports the social development of its member states as part of its mandate.
Harmonizing oil prices for the advantage of member states is not among its listed functions.
Therefore, the option that is not a function of the West African Development Bank is oil price harmonization.
Answer:D. Harmonization of oil prices to the advantage of member states.