Notes: Foundation of the Indo-Greek empire by Demetrius in 182 BC. Beginning of Vikram samvat Era in 58BC by Vikramaditya of Ujjain. Fourth Buddhist Council was held in Kundalvana, Kashmir in 72 AD under the patronage of Kushan king Kanishka. The King Kharavela of Kalinga left Hathigumpha inscription in around 50BC. So correct answer would be C.