Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways to leave out essential information. A. Because this region has been settled the longest, it also displays the greatest diversity in Native American languages. B. Fladmark's hypothesis states that the west coast of the Americas has been settled longer than any other region. C. The fact that the greatest diversity of Native American languages occurs along the west coast of the Americans lends strength to Fradmark's hypothesis. D. According to Fladmark, Native American languages have survived the longest along the west coast of the Americas.