One Factor That Seems to Predict a Successful Outcome from Participation

One factor that seems to predict a successful outcome from participation in Alcoholics Anonymous is

A) the group leader taking responsibility for identifying group members who require special assistance when they are in danger of relapsing.
B) maintaining an exclusive focus on material in the Big Book and not discussing personal problems.
C) the open discussion of group meetings with coworkers, etc.
D) active participation in meetings.