Believing That It Would Not Be Helpful, a Therapist Refuses

Believing that it would not be helpful, a therapist refuses to use the DSM-5 or any other diagnostic system. One problem that we may expect for this therapist is that it may be difficult to

A) apply what has been learned from treating other patients with similar problems.
B) think of patients as individuals.
C) monitor the progress of patients in therapy.
D) convince patients that their problems are taken seriously.