Which Statement Best Describes the Human Landscape of Middle and South

Which statement best describes the human landscape of Middle and South America just before its encounter with Europeans?

A) Human settlements were found only on the eastern coast of what is now Brazil.
B) The region was nearly devoid of humans except for small groups of nomadic peoples.
C) Many people were living in socially organized, technologically advanced cities.
D) The Incan Empire, concentrated in the highlands of Middle America, was the only human settlement at the time.