Concept:A river-basin commission coordinates the shared use of a river for trade and navigation.
Explanation:The Niger Basin Commission was formed by countries that share the River Niger.
Its main aim is to promote cooperation in developing the river’s resources.
One key objective is to manage the movement of cargo and goods along the river.
This helps to ensure safe and smooth navigation for commercial activities.
The other options relate to border control, tariffs, and dam construction, which are not its primary objectives.
Answer:C. regulate the movement of cargo along the river