Explanation:

- Jain works, specifically significant texts, were compiled in multiple historical locations.

- Option 1: Ujjain

- A major center during ancient and medieval times for culture and learning.

- Option 2: Vaishali

- An ancient city known for its links to both Jainism and Buddhism.

- Option 3: Ballabhi

- The correct answer. It was a prominent center for Jain studies and compilations in western India.

- Option 4: Vatapi

- Known for its association with the Chalukyas and not specifically with Jain scholarly compilations.