Which of the Following Statements BEST Describes the Status of Research

Which of the following statements BEST describes the status of research that has been conducted on solution-focused therapy

A) The theory underlying solution-focused therapy is easily testable and appears to be sound
B) Solution-focused therapy does not have an underlying theoretical structure
C) The theory underlying solution-focused therapy is precise
D) Solution-focused therapy does not have an underlying theoretical structure; however, the techniques have been found to be very useful