Correct Answer: (d) Ajatshatru
Solution:Vaishali was the principle republic of Vajji confederacy. The ruler of this place were Lichchivi. From the time of Bimbisara, there was estrangement in the Magadha and Vajji Confederations, which turned into conffict during the time of Ajatshatru. It is known from Nirayavali sutra that at that time Chetak was chief of Lichchivi. He prepared and united front of 9 Lichchivis, 9 Mallas and 18 Ganrajayas (of Kashi-Koshala) against the king of Magadha. As per Bhagavati Sutta, Ajatshatru was winner of all of them. He defeated Lichchivis and annexted the Vajjis to the Magadha.