Option b is the correct answer. The Majjhima Nikaya is a Buddhist scripture collection, the second of the five Nikayas, or collections, in the Sutta Pitaka, which is one of the "three baskets" that compose the Pali Tipitaka of Theravada Buddhism. The Pali Tipitaka is the oldest and most complete collection of Buddhist scriptures preserved in an Indian language. The Majjhima Nikaya consists of 152 discourses attributed to the Buddha and his chief disciples.