The correct option is B 2 and 3
Buddhism and Jainism, though they did not attack the caste system directly, were nevertheless opposed to it and can, to that extent, be described as non-caste movements. They provided an opportunity to the lower caste to opt out of their caste by joining a non-caste sect. The lack of expenses involved in rituals of worship which these sects were indifferent to, as contrasted with Brahminical worship, also attracted the same stratum in the society. So both statements 2 and 3 are correct.