The correct answer is W.E.B. Dubois.
The prominent civil rights leader that would have disagreed most with Washington’s approach to solving the problem of racial inequality in the South is W.E.B. Dubois.
William Edward Burghardt Dubois (1868-1963) was an activist, journalist, and professor that supported the rights of African Americans. With other activists, he founded the National Association for the Advancement of Colored People or N.A.A.C.P. He was the first African American to obtain a Ph. D. at Harvard University and he strongly criticized Booker T. Washington for not demanding equality for Black people.