Which one of the following most accurately states the main idea of the passage? A. Because the connections between African-American art and other art in the Americas had been established by earlier scholars, Porter's work focused on showing African-American art's connections to African artisanship. B. In addition to showing the connections between African-American art and African artisanship, Porter's most important achievement was illustrating the links between African-American art and other art in Americas. C. Despite the fact that his last book remains unfinished, Porter's work was the first to devote its attention exclusively to the accomplishments of African-American artists. D. Although showing the connections between African-American art and African artisanship, Porter's work concentrated primarily on placing African-American art in the context of Western art in general. E. While not the first body of scholarship to treat the subject of African-American art, Porter's work was the first to show the connections between African-American art and African artisanship.