The correct answer is: Ashoka.
Ashoka the Great was the third emperor of the Mauryan dynasty in India. He ruled from 272 to 232 BCE, and is considered one of the greatest rulers in Indian history. He was a patron of Buddhism, and convened the Third Buddhist Council in Pataliputra in 255 BCE.
Ajatashatru was the king of Magadha from 493 to 461 BCE. He was the son of Bimbisara, the founder of the Mauryan dynasty. Ajatashatru is best known for his conflict with his father, which led to Bimbisara’s death.
Kalashok was a king of the Kushan Empire who ruled from 127 to 151 CE. He was a patron of Buddhism, and is credited with spreading the religion to Central Asia.
Kanishka was a king of the Kushan Empire who ruled from 127 to 151 CE. He was a patron of Buddhism, and is credited with spreading the religion to Central Asia.
The Third Buddhist Council was a council of Buddhist monks that was held in Pataliputra in 255 BCE. The council was convened by Ashoka the Great, and was attended by over 1,000 monks. The purpose of the council was to discuss and resolve various issues that had arisen in the Buddhist community. The council also produced a new version of the Buddhist scriptures, which is known as the Pali Canon.