Option a is the correct answer. Rock Edict 1, inscribed by Ashoka, specifically prohibits the slaughter of animals and bans certain festive gatherings involving the killing of animals. This edict highlights Ashoka's commitment to non-violence and his effort to promote compassion towards all living beings. In this edict, he even mentions that he wishes to discontinue the practice of killing two peacocks and one deer that had been taking place in his kitchen.