A Very Large Meta-Analysis (Didden Et Al

A very large meta-analysis (Didden et al.,1997) on the treatment of problem behavior of people with mental retardation found that:

A) conduct of a functional analysis provided did not improve treatment outcome.
B) contingency management procedures were more effective than other procedures.
C) stimulus control was by far the most effective behavior intervention of the 64 studied.
D) use of a formal behavioral analysis made treatments longer and more complicated to implement.