According to Langston Hughes’s essay “The Negro Artist and the Racial Mountain” (his answer to George Schuyler’s essay “Negro Art Hokum”), what is the “mountain” that stands in the way of “any true Negro art in America” ?

A. It is the racial discrimination endemic in the white community.
B. It is the racial segregation in the South.
C. It is a widespread “urge toward whiteness” among African Americans.
D. It is a widespread “urge to incorporate and neutralize other cultures” among white Americans.