Why does the author state that "A large natural lake may have existed at the western end of Chaco, near the biggest concentration of great houses"? A. To suggest that geological studies are better than archaeological studies in identifying the historical uses of land B. To demonstrate that large construction projects require a large population of workers C. To support the idea that Chaco may have been favorable to agriculture during the Bonito phase D. To show that the Chacoan people preferred to build their homes near water