Answer: Participant modeling
Explanation:
Participant modeling is defined as the method in which a therapist tries to help the client or patient through demonstrating model of the behavior and then assisting him/her to imitate the same behavior.
This techniques is used in the field of psychotherapy for making the patient learn about the correct behavior to be performed in a situation.
According to the question, Ralph is being taught participant modeling from his therapist . Therapist is teaching him to cope with teasing events by demonstrating the act and behavior he should do in that situation .He makes Ralph to enact that behavior as well to eliminate his rude and anxious behavior.