Given the information in the passage, Porter's identification of the ancestry of Duncanson and Johnston provides conclusive evidence for which one of the following statements? A. Some of the characteristics defining the Hudson River school are iconographically linked to Weston African artisanship. B. Some of the works of Duncanson and Johnston are not in the style of the Hudson River school. C. Some of the work of Euro-American painters displays similarities to African-American crafts of the eighteenth and nineteenth centuries. D. Some of the works of the Hudson River school were done by African-American painters. E. Some of the works of Duncanson and Johnston were influenced by West African artifacts.