The correct answer to the question "What was W. E. B. Du Bois's 'Exhibit of American Negroes'?" is:
D. An exhibit in Paris to argue against negative ideas of African Americans.
W. E. B. Du Bois's "Exhibit of American Negroes" was a display he organized at the 1900 Paris Exposition Universelle. The exhibit aimed to challenge and counteract the prevailing negative stereotypes and misconceptions about African Americans that were commonly held at that time. Du Bois curated a collection of photographs, charts, and other visual materials to showcase the achievements, contributions, and intellectual capabilities of African Americans. This exhibition was a pioneering effort in promoting racial equality and challenging racial prejudices through visual means. It was a significant event in Du Bois's advocacy for civil rights and social justice.