Why did buddhism become popular in india?

plz i need it right now the answer plz plz i mean right now plz
and it has o be 3 sentences ok

At the time the ascetic religious system in India called Jainism, was unequal in that it favored the higher classes and granted them greater spiritual potential/reward. Buddhism became popular because it allowed even the lowly lower classes to reach Nirvana. In other words everyone could reach Nirvana, a place of perfect peace and happiness, much like the Christian idea of heaven.

Ibelieve that the answer is (a).

D, because civic virtue is basically doing what’s morally good.