Answer:
C) Adding the 13th Amendment to the US Constitution abolished slavery in United States.
Step-by-step explanation:
The 13 Amendment was added to Constitution after civil war and it aimed to end slavery and involuntary solitude except when the reason case of punishment. It was passed by Congress in early 1865 and ratified later by the state in the same year.
The 13 Amendments forms part of the Reconstruction Period together with the 14 and the 15 Amendments. Unlike these other two amendments that apply only to government, the 13 amendment also applied to private citizens. However, inequality and discrimination continued way after the amendments.