Correct option is C
Mahavira, the 24th Tirthankara of Jainism, is credited with adding the doctrine of Brahmacharya (celibacy or chastity) to the existing four vows of Jainism. Before Mahavira, Jainism emphasized four main vows: Ahimsa (non-violence), Satya (truthfulness), Asteya (non-stealing), and Aparigraha (non-possession). Mahavira introduced Brahmacharya as the fifth vow, thereby completing the five vows (Panch Mahavratas) that form the ethical foundation of Jain monastic life.