Answer:
My choice is C. The Thirteenth Amendment abolished slavery throughout the United States.
It was passed in 1865 and declared that 'neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.'
This was a major step forward in the fight for civil rights and helped to ensure that all Americans were treated equally.