You Have an Adolescent That Has Suddenly Withdrawn from Group

You have an adolescent that has suddenly withdrawn from group interactions. In the initial interview he denied any suicide attempts however records show there have been suicide attempts in the past. What are the two most appropriate options?

A) Call the parents immediately.
B) Call a group meeting and confront him with past suicide attempts.
C) Schedule an interview and express concerns, continue with crisis intervention stages as seen appropriate.
D) Flag the file as suicide watch, report concerns at staff meeting.