How Might a Behavior Therapist Attempt to Help a Client

How might a behavior therapist attempt to help a client suffering from depression?

A) By helping the client understand how past trauma could be affecting current mood states.
B) By helping the client to engage more frequently in activities the client finds enjoyable.
C) By exploring the role of interpersonal relationships in the client's life.
D) By exploring feelings of shame, remorse, and guilt in the client's life.
E) All of the above are often used by behavior therapists.