The correct option is A Megasthanes
Megasthanes was the Greek ambassador in the court of Chandragupta Maurya. Megasthenes was born in Asia Minor and became an ambassador of Seleucus I Nicator of the Seleucid dynasty to Chandragupta Maurya in Pataliputra, India. Chandragupta Maurya was the founder of the Maurya Empire in ancient India. Born to a humble background, he was taught and counselled by the philosopher Chanakya, who had great influence in the formation of his empire.