The correct answer is C. Ajatashatru.
Ajatashatru was the king of Magadha from 493 to 462 BCE. He was the son of Bimbisara, the founder of the Mauryan Empire. Ajatashatru is best known for his conflict with the Buddha and his conversion to Jainism.
According to the Jain texts, Ajatashatru was a cruel and violent ruler. He was responsible for the death of his father, Bimbisara, and the persecution of the Jains. However, after meeting the Buddha, Ajatashatru was converted to Jainism and became a devout follower of the religion. He renounced his kingdom and became a wandering monk.
Ajatashatru’s conversion to Jainism is a significant event in the history of the religion. It shows that even a powerful and violent ruler could be transformed by the teachings of the Buddha.
The other options are incorrect. Chandragupta Maurya was the founder of the Mauryan Empire. He was not a Jain. Bindusara was the son of Chandragupta Maurya and the father of Ashoka the Great. He was not a Jain. Pulakesin was the founder of the Chalukya dynasty. He was not a Jain.