The correct answer is C) racism towards African Americans.
The main social basis of the Jim Crow system was racism towards African Americans.
Jim Crow laws were a sad moment in US history. The laws increased racial segregation. The antecedent of the Jim Crow laws can be traced back to the Black Codes in the Southern States during the Reconstruction period. Jim Crow laws were enacted in the late 19th century and the beginning of the 20th century.