The Text Authors Offer Which of the Following Concluding Caveats

The text authors offer which of the following concluding caveats about the nature of controlled research on systemic therapies?

A) Much of the research has been conducted on particular kinds of therapy systems,and not the family treatment format.
B) The majority of research has been conducted on the family treatment format,not on systemic therapy Itself.
C) MST is the only systemic therapy with any real evidence base.
D) Parents are too infrequently included in the treatment of child and adolescent disorders,thus limiting our understanding of the impact of parents on behavior change in youth.