The correct answer is Option 2- Pataliputra
The third Buddhist Council was held in Pataliputra in the 3rd century BCE. It was convened by the Mauryan emperor Ashoka the Great. The council was attended by 1,000 monks, and it was presided over by Moggaliputta Tissa.
Buddhist Councils: Location and Presiding Figures
First Council:
Location: Sattapanni Caves, Rajgriha (present-day Rajgir)
Patronage: King Ajatashatru
Presided by: Mahakassapa (monk)
Second Council:
Location: Vaishali
Patronage: Uncertain
Presided by: Uncertain (possibly several elders)
Third Council:
Location: Pataliputra (present-day Patna)
Patronage: Emperor Ashoka
Presided by: Moggaliputta Tissa (monk)
Fourth Council:
Location: Kundalvana, Kashmir
Patronage: King Kanishka
Presided by: Vasumitra and Ashvaghosha (monks) | 
