Which Judicial Approach Was Influenced by the 13th Amendment, Which

Which judicial approach was influenced by the 13th Amendment, which states 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 . . ."?

A) The hands-on doctrine, which suggested that prisoners have constitutional rights.
B) The free-world doctrine, which believes that prisoners retain rights to carry on communications through mail.
C) The prisoners'-rights doctrine, which argues that prison inmates retain all the rights of free citizens except those which involve due process.
D) The hands-off doctrine, which argues that prisoners were "slaves of the state."