Explanation:

3rd option is correct.
Hiuen Tsang found Jainism flourishing in Bengal.
Hiuen Tsang (also Xuanzang, Hsuan Tsang) was the celebrated Chinese traveler who visited India in Ancient Times. He has been described therefore as the “Prince of Pilgrims.”
His visit to India was an important event of the reign of Harshavardhana. India is much indebted to this Chinese traveller for the valuable accounts he left behind with many details of political, religious, economic, social conditions of those days.