The correct answer is: C. Do not commit violence.
Mahavira was the 24th Tirthankara, the founder of Jainism. He is considered to be the last of the enlightened teachers who have appeared on Earth to guide humanity towards liberation.
One of the most important doctrines of Jainism is ahimsa, or non-violence. This doctrine prohibits all forms of violence, including physical violence, verbal violence, and mental violence. It also prohibits the consumption of meat and other animal products.
Mahavira believed that ahimsa was essential for achieving liberation. He taught that all living beings are interconnected and that violence against any living being is violence against oneself.
The doctrine of ahimsa is one of the most distinctive features of Jainism. It has had a profound impact on Jain culture and society, and it continues to be a guiding principle for Jains around the world.
The other options are also important doctrines of Jainism, but they were not added by Mahavira.
Option A: Do not speak a lie. This doctrine is known as satya. It prohibits lying, cheating, and other forms of deception.
Option B: Observe continence. This doctrine is known as brahmacharya. It prohibits sexual activity outside of marriage.
Option D: Do not steal. This doctrine is known as asteya. It prohibits the taking of anything that does not belong to you.