The correct answer for this question is option 'B' - Digambara.

The Samayasara and the Pravacanasara are considered the bible of the Digambara sect of Jainism. Jainism is an ancient Indian religion that emphasizes non-violence (ahimsa), truth (satya), non-stealing (asteya), celibacy (brahmacharya), and non-attachment (aparigraha) as its core principles. It was founded by Lord Mahavira, who was the 24th and last Tirthankara (spiritual teacher) of Jainism.

Now, let's understand why the Samayasara and the Pravacanasara are considered the bible of the Digambara sect.

1. Digambara Sect:
- The Digambara sect is one of the two main sects of Jainism, the other being the Svetambara sect.
- The Digambara tradition believes in the complete nudity of monks as a symbol of renunciation and spiritual liberation.
- They believe that women cannot attain liberation without being reborn as men.
- The Digambara sect is mainly found in the southern parts of India.

2. Samayasara:
- The Samayasara is a philosophical text written by Acharya Kundakunda, who was a revered Jain scholar and philosopher.
- It is considered one of the most important scriptures of the Digambara sect.
- The Samayasara discusses the nature of the soul (jiva), the concept of karma, and the path to liberation (moksha) in great detail.
- It provides detailed explanations of the Jain principles and practices, including the five vows (mahavratas) of Jainism.

3. Pravacanasara:
- The Pravacanasara is another important text authored by Acharya Kundakunda.
- It is considered a concise and comprehensive guidebook of the Jain doctrine.
- The Pravacanasara focuses on the practical aspects of Jainism, including the three jewels of right faith (samyak-darshana), right knowledge (samyak-jnana), and right conduct (samyak-charitra).
- It outlines the path of purification and liberation through the practice of meditation, self-discipline, and ethical living.

In conclusion, the Samayasara and the Pravacanasara are revered as the bible of the Digambara sect of Jainism. These texts provide a deep understanding of Jain philosophy, ethics, and the path to spiritual liberation. They are considered essential scriptures for the followers of the Digambara tradition.