What Was the Supreme Court's Response to the Civil Rights

What was the Supreme Court's response to the Civil Rights Act of 1875?

A) The justices declared the act constitutional.
B) The justices declared the act unconstitutional because it protected against acts of private discrimination, not state discrimination.
C) The justices declared the act unconstitutional because Congress had violated the principles of federalism.
D) The justices declared the act unconstitutional because Congress had violated the separation of powers.
E) The Supreme Court justices never heard a case concerning the constitutionality of this act.