Which of the following statements is true of outcome evaluation?​

A) ​It involves identifying aspects of the helping process that were useful or detrimental to client progress.
B) ​It addresses how closely the skills used by a program match the design of the intervention.
C) ​It involves assessing client progress by looking at changes in the severity of problems.
D) ​It uses formative evaluation to determine whether the techniques used for intervention were delivered efficiently.