Paragraph 2 supports the idea that, before the 1970s, most archaeologists held which of the following views about the earliest people to reach the Americas? A. They could not have sailed directly from Beringia to Alaska and then southward because, it was thought, glacial ice covered the entire coastal region. B. They were not aware that the climate would continue to become milder. C. They would have had no interest in migrating southward from Beringia until after the continental glaciers had begun to melt. D. They lacked the navigational skills and appropriate boats needed long-distance trips.