Step 1: Understanding the question.
The question asks about the fifth Mahavrata added by Mahavira to the existing Four Mahavratas propounded by Parshvanath.
Step 2: Historical context.
Parshvanath propounded four Mahavratas (Non-violence, Truth, Celibacy, and Non-possession), and Mahavira later added the fifth one, which was "Stealth."
Step 3: Analysis of the options.
• (A) Non-violence: Incorrect. Non-violence was already part of the Four Mahavratas propounded by Parshvanath.
• (B) Celibacy: Incorrect. Celibacy was also part of the Four Mahavratas.
• (C) Truth: Incorrect. Truth was another one of the Four Mahavratas.
• (D) Stealth: Correct. Stealth was the additional fifth Mahavrata introduced by Mahavira.
Step 4: Conclusion.
The correct answer is (D) Stealth, as it was the fifth Mahavrata added by Mahavira.
Final Answer: Stealth.