Which of the following did W.E.B. Du Bois say in his opposition to Marcus Garvey?

A. Du Bois disagreed with Garvey's emphasis on civil rights.
B. Du Bois criticized Garvey's promotion of racial pride.
C. Du Bois questioned the practicality of Garvey's Back-to-Africa movement.
D. Du Bois opposed Garvey's efforts to establish the Universal Negro Improvement Association (UNIA).