What Did Research on Offenders Sent to Prison and Those

What did research on offenders sent to prison and those that were sentenced to community service show?

A) Offenders sent to prison have lower recidivism rates than those doing community service.
B) Offenders doing community service have higher rates of recidivism than those sent to prison.
C) There was no difference in recidivism rates between the two groups.
D) Recidivism rates were affected only when both groups were forced to take a morality (ethics) course.