Correct Answer: (c) Girivraj (Rajgriha)
Note: Rajgriha was the first capital of Magadha, (Where first 'Buddhist Council' was organized and Lord Mahavir sermoned first). According to Puranas, the first dynasty to rule over Magadh was Brihadrath dynasty. King Brihadrath's son, Jarasandha, made Girivraja (Rajgir) his capital. Later on, Udayin, son of Ajatshatru, mover the capital to Patliputra.