James Pennebaker's Work on "Opening Up" About the Experience of Traumatic

James Pennebaker's work on "opening up" about the experience of traumatic events finds that expressing one's thoughts and feelings about these events is helpful primarily because

A) the release of emotion calms down physiological arousal.
B) it provides the opportunity to receive social support.
C) it fosters insights and increased self-awareness.
D) it prevents anger from building up and becoming uncontrollable.