I BEG U TOO HELP ME Which river did West Africans from Jenne-Jeno to Timbuktu use as a natural highway for trade?

Nile River

Congo River

Niger River

Ghana River

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

i believe he should not do investment b