Option c is the correct answer. The Fourth Buddhist Council took place in 72 AD at Kundalvana, near Srinagar, Kashmir, under the support of King Kanishka of the Kushan dynasty. Vasumitra was the head of the council, with Asvaghosa as his assistant. The main goal of the fourth council was to address a serious disagreement between the Gandhara and the Sarvastivada teachers from Kashmir. During this council, the beliefs of the Sarvastivadins were organized into a Mahavibhasa, which included three large explanations of the pitakas.