Native American tribes with their autochthonous civilizations and customs lived on the continent of South America long before the discovery of this continent and its settlement by the Portuguese and the Spaniards, as well as the occasional emigration from Africa to this continent. The largest percentage of autochthonous peoples today live in Bolivia and Peru where they make up about half the population, in which many people still practice the traditional way of life.
The answer is: b.
