Which of the Following Is Not Believed to Be a Reason

Which of the following is not believed to be a reason that people fail on parole?

A) Parolees are released into the same environment which contributed to their deviant behavior in the first place.
B) Personal deficits that led to an offender's imprisonment are not addressed by institutionalization.
C) The prison experience itself focuses more on punitive efforts than rehabilitation.
D) The parole system places unrealistic expectations on ex-offenders that they cannot possibly meet.