Question

the black codes were written to
limit the economic freedom of former slaves.
protect former slaves against the ku klux klan
increase the rights of former slaves.
free northern slaves.

Explanation:

The Black Codes were restrictive laws passed in the South after the Civil - War to control the labor and behavior of former slaves, limiting their economic freedom. They were not meant to protect former slaves from the Ku Klux Klan, increase their rights, or free northern slaves (as slavery was already abolished in the North).

Answer:

limit the economic freedom of former slaves.