Congress shall have the power to enforce this article by appropriate legislation.

the above phrase is called the enforcement clause, and it appears at the end of the 13th, the 14th, and the 15th amendments.
which of the following is an example of this enforcement clause being exercised?

the black codes of 1865
the federal election campaign act of 1971
the civil rights act of 1964
the freedom of information act of 1974