Rik's changes in behavior are due to the process of identity.
During adolescence, a fundamental aspect is consolidated to understand the psychology of each person: identity, this is not based only on the adolescent's personality, but is also configured based on their social self, on the experiences shared with the friends of institute or their relatives, in addition to extracurricular activities.
Therefore, we can conclude that adolescence is a stage of change and search for identity.
Learn more about the adolescence here: https://brainly.com/question/24856167