(A) Zambezi River
(B) Kasai River
(C) Orange River
(D) Ubangi River
Correct Answer is: B
Bodies of hippos and dead fish were seen floating in the river. The pollution was first detected in a tributary of the Kasai River, named the Tshikapa. The Kasai is a tributary of the Congo River. The pollution originates from a major spill at three mining facilities around in Angola. Researchers also fear the potential for lasting contamination of groundwater.