Which of the following best states the author's main point? A. Pessen's study has overturned the previously established view of the social and economic structure of early-nineteenth-century America. B. Tocqueville's analysis of the United States in the Jacksonian era remains the definitive account of this period. C. Pessen's study is valuable primarily because it shows the continuity of the social system in the United States throughout the nineteenth century. D. The social patterns and political power of the extremely wealthy in the United States between 1825 and 1850 are well documented. E. Pessen challenges a view of the social and economic systems in the United States from 1825 to 1850, but he draws conclusions that are incorrect.