Passage Summary: There are only two good ways to think about prison sentences: punishment or reform. If you're focused on punishment, the crime must fit the time. Since giving repeat offenders extra time doesn't always fit the specific crime, that approach doesn't work for a punishment-based theory.

Reasoning: Acceptable sentencing theories must be either retributivist or rehabilitationist; retributivist theories must be proportional, but those that increase sentences for repeat offenders are not proportional.

Analysis: We are looking for a valid deduction based on the rules provided. We know that Retributivist theories that increase sentences for repeat offenders are not proportional. Since being proportional is a requirement for a Retributivist theory to be acceptable, any Retributivist theory that increases sentences for repeaters is unacceptable. Look for an answer that concludes these specific types of theories fail the 'acceptability' test.