How Did the Supreme Court Rulings in the Slaughterhouse Cases

How did the Supreme Court rulings in the Slaughterhouse cases affect the status of African Americans?

A) These rulings harmed African Americans by providing loopholes and limitations that constrained federal protection of African American civil rights.
B) These rulings harmed African Americans by forcing the repeal of all aspects of the Civil Rights bill.
C) These rulings had no effect on African Americans, as they pertained to issues between the states and the federal government.
D) These rulings benefited African Americans by confirming that the state could not outwardly discriminate on the basis of race.