An Experimental Design Model Would Be Helpful in a Study

An experimental design model would be helpful in a study involving faith-based counseling and recidivism among violent ex-offenders if:

A) the research was intended to determine the actual effect that faith-based counseling has on recidivism.
B) faith-based counseling could be conceptually defined and measured.
C) some of the inmates were willing to recidivate in order to insure the results are publishable.
D) the prison wardens had a favorable opinion about faith-based counseling.