Correct Answer:
Option C - In 321 BC, Chandragupta Maurya with the help of Chanakya/Kautilya (author of Arthashastra) founded the Mauryan dynasty after overthrowing the last ruler of Nanda dynasty, Dhanananda.
C. In 321 BC, Chandragupta Maurya with the help of Chanakya/Kautilya (author of Arthashastra) founded the Mauryan dynasty after overthrowing the last ruler of Nanda dynasty, Dhanananda.