[单选题]尿毒症最常见的病因是( )
A.原发性高血压
B.慢性肾小球肾炎
C.慢性肾盂肾炎
D.肾动脉硬化
E.红斑狼疮性肾炎.

Du Bois was a sociological and educational pioneer who challenged the established system of education that tended to restrict rather than to advance the progress of black Americans. He challenged what is called the "Tuskegee machine" of Booker T. Washington, the leading educational spokesperson of the blacks in the US. A sociologist and historian, Du Bois called for a more determined and activist leadership than Washington provided.
Unlike Washington, whose roots were the southern black agriculture, Du Bois’s career spanned both sides of the Mason-Dixon Line. He was a native of Massachusetts, received his undergraduate education from Fisk University in Nashville, did his graduate study at Harvard University, and directed the Atlanta University Studies of Black American Life in the South. Du Bois approached the problem of racial relations in the United States from two dimensions: as a scholarly researcher and as an activist for civil rights. Among his works
A. the blacks have a priority in terms of education
B. higher education should be free for all races
C. everyone has an equal right to education
D. development in education should be gradual