Katie Has an Anxiety Disorder and Recently Sought Treatment for It

Katie has an anxiety disorder and recently sought treatment for it. The therapist explained that the anxiety stemmed from her early childhood experiences. When Katie was young, her parents divorced. Her anxiety increased when her dad abandoned Katie, and when her mom decided to start another family with her new husband. According to Katie's therapist, Katie has unresolved unconscious conflicts involving fear of abandonment in addition to aggression toward her father. From which psychological perspective is this explanation?

A) biological perspective
B) cognitive perspective
C) learning perspective
D) psychodynamic perspective