What Economic Factor Weakened the Hold of Buddhism on the Indian

What economic factor weakened the hold of Buddhism on the Indian population?

A) The improving status of the peasantry made them less likely to be interested in a salvationist religion.
B) The untouchables were decimated by a severe famine, thus removing a class associated with Buddhism.
C) The failure of the Rome-China trade axis weakened the merchants, who had been one of the chief benefactors of the Buddhist monasteries.
D) The increasing wealth of all social classes reduced the strictness of social division within the caste system and undermined one of the attractions of Buddhism.