Final answer:
W.E.B. Du Bois is one of the founding members of the NAACP and believed in the problem of the colored line. He advocated for equal rights for African-Americans and opposed Booker T. Washington's approach.
Step-by-step explanation:
W.E.B. Du Bois is one of the founding members of the NAACP and believed that the problem of the 20th century was the problem of the colored line. He was an African-American historian, sociologist, and activist who championed equal rights for African-Americans. Du Bois actively opposed Booker T. Washington's approach and supported political and social equality for African-Americans.