A
Cameroon
B
Nigeria
C
South Sudan
D
Uganda
Correct answer: (a) Cameroon
Explanation
- A
Cameroon
Cameroon. Western Congo Basin; rainforest drains to the Congo system.
- B
Nigeria
Nigeria. Niger basin and Guinea coast, not the Congo Basin proper.
- C
South Sudan
South Sudan. Nile (White Nile / Sudd), not Congo.
- D
Uganda
Uganda. Nile and East African lakes; only a sliver is Congo-facing.
Summary. Official key is (a) Cameroon. The Congo Basin is the catchment of the Congo River — DRC, Congo-Brazzaville, CAR, Gabon, Equatorial Guinea and Cameroon. Nigeria is Niger–Benue; South Sudan and Uganda sit on the Nile side.