Kautilya was the political advisor of Chandragupta Maurya. He was a great thinker and wrote the Arthashastra, a treatise on statecraft.
Dhana Nanda was the last ruler of the Nanda dynasty. He was a cruel and oppressive ruler.
Bimbisara was the king of Magadha before Chandragupta Maurya. He was a powerful and ambitious ruler.
Ajatashatru was the son of Bimbisara. He was the one who killed his father and ascended the throne of Magadha. He was a ruthless and cunning ruler.
Chandragupta Maurya was the founder of the Mauryan Empire. He was a great conqueror and statesman. He was also a patron of arts and literature.
The correct answer is: D. Chandragupta Maurya