During a Counseling Session,Lucy Says,"My Mother Is Such a Jerk

During a counseling session,Lucy says,"My mother is such a jerk.She is always telling me what to do and will not let me do anything I want to do." Her counselor responds with,"So you feel frustrated because your mother treats you like a child instead of an adult." Lucy feels understood and is able to discuss other problems she has been having.
A) With what type of therapy is Lucy being treated?
B) Explain what technique Lucy's therapist is using in this situation.
C) What is the most important component of this therapy (in other words,what is the therapist trying to establish by using these techniques)?