Based on a Review of the Research Published in 2011

Based on a review of the research published in 2011 by Durlauf and Nagin which of the following statements is most accurate?

A) Long prison sentences are difficult to justify on a deterrence-based,crime prevention basis.
B) Long prison sentences tend to moderately decrease crime.
C) Long prison sentences are easy to justify on a deterrence-based,crime prevention basis.
D) Long prison sentences are easy to justify on a deterrence-based,crime prevention basis,but only for young offenders.