Which one of the following is a part of the Congo Basin?

1. The Congo Basin is the sedimentary basin of the Congo River, the second-largest river basin in the world, located in west-equatorial Africa. 2. It encompasses a vast area primarily including the Democratic Republic of the Congo, the Republic of the Congo, Gabon, Equatorial Guinea, the Central African Republic, and significant portions of Cameroon. 3. Evaluating the options: - (A) Cameroon: The southern and eastern parts of Cameroon lie within the Congo Basin. - (B) Nigeria: Located in West Africa, it is not part of the Congo Basin. - (C) South Sudan: Located in East-Central Africa, it is primarily drained by the Nile River system, not the Congo. - (D) Uganda: Located in East Africa, it is also primarily drained by the Nile River system. 4. Therefore, Cameroon is the only country among the options that is part of the Congo Basin.