What brought about the end of the west african empires?

Identity the type of narration used in the excerpt. which words in the excerpt indicate the type of narration? what is the effect of this point of view on the reader’s interpretation of the information presented? the excerpt from what maisie knew by henry james

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need

Me i'm crying, 2 hour left till i have to submit ! brainliest!