One of the main obstacles of establishing the Niger River Basin Commission was t...

The question is asking about the main obstacle to establishing the Niger River Basin Commission. The Niger River Basin Commission is an organization that focuses on the development and management of the Niger River Basin, which includes several countries in West Africa.

Option A suggests that one of the main obstacles was to conduct a comprehensive survey of the available water resources. This means that before establishing the commission, they needed to gather information about the amount and quality of water in the Niger River Basin. However, this is not the correct answer.

Option B suggests that the obstacle was to carry out research for the development of fresh water fisheries. Fresh water fisheries refer to the breeding, rearing, and harvesting of fish in freshwater environments. While this may be an important aspect of the commission's work, it is not the main obstacle to establishing it.

Option C states that the obstacle was to develop infrastructure to facilitate economic activities. Infrastructure refers to the basic physical structures and facilities needed for the operation of a society or enterprise. In this case, the commission needed to create infrastructure such as dams, irrigation systems, and transportation networks to support economic activities in the Niger River Basin. This is the correct answer because it addresses the main challenge of establishing the commission.

Option D suggests that the obstacle was to promote trade among member states to improve standards of living. While trade promotion and improving standards of living are important goals of the commission, they are not the main obstacle to its establishment.

In summary, the correct answer is Option C: develop infrastructure to facilitate economic activities. This means that one of the main challenges in establishing the Niger River Basin Commission was to create the necessary physical structures and facilities to support economic activities in the region.