What Was the Status of Buddhism in India Following the Fall

What was the status of Buddhism in India following the fall of the Gupta empire?

A) It continued to decline in the face of the Gupta preference for Hinduism and the dislike of the succeeding military rulers for Buddhist principles.
B) Buddhism declined, but retained a presence in India as it was adopted by the Hunnic invaders.
C) Buddhism was resurrected as a major religion in India because it was adopted by many of the regional leaders who sought to buttress their authority.
D) Buddhism replaced Hinduism as the primary religion of the Indian population, although it was outlawed by the ruling military princes.