What is the general conclusion on research designed to match certain types of patients to particular alcohol treatment programs?

a. There is little evidence for the effectiveness of matching.
b. The primary variable predicting treatment success is the accuracy of the match.
c. The success of these matches depends primarily on the client's level of comorbid conditions.
d. Age, socioeconomic status, and other demographic factors are the key to creating a good match.

Answer: a.