Mr. Rawlins is faculty advisor for the high school service club. He attends every meeting, and he regularly provides the support students need to carry out their activities. During group discussions, however, he typically sits in the back of the room and offers advice only if club members ask for it or if he thinks the club’s planned activities are in some way inappropriate. In taking this approach, Mr. Rawlins is most likely to:

a. Promote debilitating anxiety
b. Decrease club members' sense of competence
c. Enhance club members' sense of autonomy
d. Reduce club members' interest in public service