The purpose of institutional treatment programs in prisons primarily aims at:

The primary aim of institutional treatment programs in prisons is the rehabilitation of offenders. Rehabilitation focuses on helping inmates change their behavior and attitudes so they can reintegrate into society as productive citizens upon their release. This approach acknowledges that many individuals commit crimes due to a variety of underlying issues, such as addiction, lack of education, or mental health challenges. Therefore, treatment programs, which may include counseling, educational courses, vocational training, and substance abuse programs, are designed to address these specific needs and promote positive change.

In contrast, punishment primarily emphasizes retribution and often does not involve efforts to change the behavior of the offender. Isolation serves to separate offenders from society but does not actively contribute to their rehabilitation. Deterrence aims to prevent crime through the fear of punishment, which may not necessarily lead to personal change in the offender's behavior. Thus, the correct answer reflects the overarching philosophy of modern corrections, which increasingly prioritizes rehabilitation efforts over mere punishment or deterrence.