It was in ______ that he decided to dedicate his life to the struggle against racial oppression.

A．the Civil War had eliminated racial discrimination in the U.S.
B．his grandmother could recite the history of the western world
C．Du Bois was considered something of a prodigy and very promising
D．his great-grandfather had fought in the American war of independence

A．believed hard work and success were the only way to win respect
B．rejected the idea of tentative tolerance of racial discrimination
C．encouraged organized violence as part of the struggle for equality
D．took it as his ultimate goal to build an independent nation of blacks