Why does the author mention the views of "Patrick Kirch"? A. To present evidence in favor of Heyerdahl's idea about American Indians reaching Oceania B. To emphasize the familiarity of Pacific islanders with crops from many different regions of the world C. To indicate that supposed proof for Heyerdahl's theory has an alternative explanation D. To demonstrate that some of the same crops were cultivated in both South America and Oceania