What Were "Black Laws

What were "black laws"?

A) laws passed in the states of the Old Northwest during the early-nineteenth century that set up rights for blacks, including rights previously held by whites only
B) laws passed in the states of the Old Northwest during the early-nineteenth century banning or restricting black settlement
C) early-nineteenth century laws that forbid blacks from entering certain professions like law and medicine
D) early-nineteenth century laws passed in the states of the Old Southwest that segregated blacks on all forms of public transportation