Olga is constantly depressed and decides to see a therapist about her depression. the therapist believes that olga's depression is due to unresolved unconscious anger toward her parents in childhood. this therapist would be most likely to use what type of therapy to treat olga's depression?

This therapist would be most likely to use "psychoanalysis".

psychoanalysis is a set of tactics about the the study of unconscious mind, as the therapist believes that Olga's depression is due to unresolved unconscious anger toward her parents in childhood the process or technique of psychoanalysis will help resolve the issue.