Read the following paragraph from the introduction [paragraphs 1-3]. "The Andes are some of the tallest, starkest mountains in the world. Yet the Incas, and the civilizations before them, coaxed harvests from the Andes’ tough climate. They developed hardy breeds of crops such as potatoes, quinoa and corn. They built cisterns and irrigation canals that snaked and angled down and around the mountains. They also cut terraces into the hillsides from the valleys up the slopes. At the height of the Incan civilization in the 1400s, the system of terraces covered about a million hectares, or about 3,800 square miles, throughout Peru."
Why does the author include this paragraph in the article?
to demonstrate that the Incan farming methods are obselete
to explain that the Incan farming systems were effective
to criticize modern farmers for attempting to recreate ancient farming systems
to compare South American farming systems before and after the Spanish conquest