Which of the following is not an objective of ECOWAS?

The Economic Community of West African States (ECOWAS) is a regional economic union of fifteen West African countries. Its main objectives include expanding trade among member states, encouraging free movement of persons, improving infrastructure, and promoting economic cooperation. Therefore, the option that is not an objective of ECOWAS is "promoting a common language." While language may be a factor in promoting regional integration, it is not specifically listed among the objectives of ECOWAS.