The correct option is D A and R are correct.
Guru Amardas Ji was a social reformer. He discouraged social practices like Sati, untouchability, and Purdah system. He also believed in equality and discouraged casteism. To combat the practice of untouchability, he granted audience to only those who sat in a Pangat and ate Langar irrespective of their caste, without questioning who cooked the food.