What change affected prisoners in the mid-1800s?

Prisoners were sentenced to death.

Prisoners were given parole for good behavior.

Prisoners were given special training and therapy.

Prisoners were allowed to appeal their convictions.

All of the options listed could potentially be changes that affected prisoners in the mid-1800s, but the specific change that had a significant impact during that time period was that prisoners were allowed to appeal their convictions. This was a major development in the criminal justice system, as it provided inmates with the opportunity to challenge the legality or fairness of their convictions and seek a retrial or a reduction in their sentence.