The correct answer is letter D
He was an American sociologist, historian, activist, author and editor. Born in the interior of the state of Massachusetts, Du Bois grew up in a tolerant community, hardly a victim of racism during his childhood. After graduating from Harvard, where he became the first African American to earn a doctorate, he became professor of history, sociology and economics at the University of Atlanta. Du Bois was one of the founders of the National Association for the Advancement of Colored People (NAACP) in 1909.
Racism was always the main target of Du Bois' criticism, as he always denounced the lynching of blacks, the laws of Jim Crow and discrimination in education and employment in his writings. Its cause also included so-called people of color from other countries, especially those from Africa and Asia, who, at the time, were fighting colonialism and imperialism. He was the proponent of Pan-Africanism and helped to organize several Pan-African Congresses to defend the liberation of African colonies from European powers. During his life, Du Bois made several trips to Europe, Africa and Asia. After the First World War, he researched the experiences of African American soldiers in France and denounced the intolerance present in the United States Army.