Which of these is an example of a "Black Code"? A. a state law passed in Mississippi in 1865 that required freed black men to have written evidence of employment or face imprisonment
B. the Thirteenth Amendment to the Constitution
C. a clause in the Fourteenth Amendment that guaranteed equal protection under the law
D. an act passed in 1854 that stated that a vote would determine whether slavery would be allowed in the Kansas and Nebraska territories

I will make brainest if you explain why​