Which Statement BEST Describes Why Treatment Outcomes Vary in Clients

Which statement BEST describes why treatment outcomes vary in clients?

A) Success of treatment is largely dependent on the client's expectations regarding therapy.
B) Many factors, both on the client side and on the clinician side, can affect therapy outcomes.
C) A large number of clinicians do not use standardized rating scales to monitor client progress during therapy.
D) Clients commonly try to self-medicate and manage their symptoms on their own rather than adhering to prescribed therapies.