The correct answer is A) They divided the South into five military districts.
The Reconstruction Acts of 1867 were focused on the structure of the South after the Civil War. Since the Southerns states were rejoining the Union after a four year war, the Northern politicians wanted to ensure that the Southern states would not cause problems again. Creating these five military districts allowed the federal government to supervise the Southern states to ensure that they would follow the laws of the US (such as getting rid of the institution of slavery).