Correct Option: D

Vikramashila Mahavihara was established by the Pala emperor Dharmapala in the late 8th century CE. The Pala dynasty ruled over parts of present-day eastern India and Bangladesh from the 8th to the 12th century, and they were great patrons of Buddhism and Buddhist institutions like Vikramashila. Vikramashila Mahavihara was one of the most important centers of Buddhist learning in ancient India, attracting scholars and students from all over the Indian subcontinent and beyond. It played a crucial role in the development of Mahayana and Vajrayana Buddhism, and many important texts were composed or translated at the institution.