Which of the following is prohibited by the 8th Amendment?

The 8th Amendment of the United States Constitution specifically addresses issues related to bail, fines, and punishments, ensuring that they are not excessive or cruel. This amendment explicitly prohibits "excessive bail" which refers to bail amounts that are unjustifiably high and may serve to punish rather than secure a defendant's release pending trial. Additionally, it prohibits "cruel and unusual punishment," which serves to protect individuals from harsh or disproportionate penalties that do not fit the crime committed. The purpose of these protections is to uphold human dignity and prevent inhumane treatment by the state.

In contrast, the other options pertain to different amendments or legal principles. For example, the prohibition against double jeopardy is covered under the 5th Amendment, protecting individuals from being tried for the same crime twice. Unreasonable searches and seizures are governed by the 4th Amendment, which protects individuals against arbitrary government intrusions. Involuntary servitude is addressed by the 13th Amendment, which abolished slavery and forms of forced labor. Each of these concepts is important in the context of individual rights, but only option B directly relates to the specific prohibitions established by the 8th Amendment.