Identify the sample used in the researches below by choosing the letter of the best answer: Gance-Cleveland (in Nieswiadomy, 2008) examined the features, critical attributes, processes, and benefits of school based support groups for adolescents with an addicted parent. Participant observations were conducted weekly at two high schools over one semester. Interviews were conducted with program administrators, school administrators, group co-facilitators, and participants. School-based support group participation was found to enhance self-knowledge and led to self-care and self-healing.