One of the Major Challenges Faced by Policy Makers in Implementing

One of the major challenges faced by policy makers in implementing good prevention and rehabilitation programs is that:

A) their intensive nature makes large-scale implementation difficult
B) they are less effective when run in the community
C) they try to focus on all or most of the major causes of delinquency in a group rather than focus on only the most important cause of delinquency
D) all of the above