Legal theorist: Only two types of theories of criminal sentencing can be acceptable—retributivist theories, which hold that the purpose of sentences is simply to punish, and rehabilitationist theories, which hold that a sentence is a means to reform the offender.
Stimulus
Conditionals
~Retributivist and → ~Acceptable ~Rehabilitationist
Retributivist and → ~Acceptable Doesn't use principle that punishment = harm
Facts
A retributivist theory that punishes extra if it's a repeat offense would go against this principle.
Evaluate
The simple Conditional + Fact type inference here would be that the theory they talk about in the last sentence is not acceptable, since it doesn't adhere to the "punishment = harm" principle.
But my spidey-sense makes me think they are probably going to use the Rehab rule or the fact that there are only two acceptable theories rule, in some way.
Goal
Look for an answer that says that the Retributivist theories mentioned in the last sentence are not acceptable, or something else we can derive from the given rules.