What was the purpose of the Jim Crow laws passed by Southern states during Reconstruction?

A.
to try to keep the social order the same as it was before the Civil War
B.
to convince Northerners to migrate to and invest in the South
C.
to implement the changes required by the Reconstruction Amendments
D.
to improve the agricultural economies of the Southern states

A. to try to keep the social order the same as it was before the Civil War