The answer is B. Rhine.
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<span>The underlying rock structure of the Umgeni river</span> is mostly arenaceous rocks of the Ecca Formation.
The statement " "Per capita GNI measures average (mean) wealth, not the distribution" means that if only a few people receive much of the GNI, that is not factored in. I hope my answer has come to your help. God bless and have a nice day ahead!