Bartolomeu Dias was the first European explorer to sail around the southern tip of Africa discovering what is called the Cape of Good Hope. This discovery made it possible for Europeans to trade with Asia and India via water instead of across land, which was very expensive at the time.
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I looked this up hope this is correct
i believe the answer is c.
They could not have grown crops from the fresh wet soil and they couldn't travel along the river as good.
