What Are the Main Goals of "Program Efficacy" Studies? (Circle

What are the main goals of "program efficacy" studies? (circle all that apply)

A) determine whether the effects of a planned intervention occur as planned
B) determine if the planned intervention can be delivered effectively, given existing restraints (i.e., can it be executed in the real world under normal, expected circumstances)
C) test the intervention under the "best of all possible worlds" to provide the best chance of treatment effectiveness
D) determine the prevalence and severity of a social problem, and accordingly, whether a program is necessary