Ashoka is the answer
Asoka (Emperor of Mauryan dynasty) was the Indian ruler who converted to Buddhism as he felt guilt over the bloodshed and horror he caused during the Kalinga (modern Orissa) war. The Kalinga War was fought in 261 B.C which changed Asoka from Chandasoka (Asoka the wicked) to Dharmasoka( Asoka the righteous). After the war he gave up his policy of conquests and now began to work for mankind and spread of Buddhism.
The correct answer is A. Ashoka.
Ashoka was an Indian ruler who was converted to Buddhism. He was an emperor in India on the side of Maurya Dynasty whereby he ruled Indian subcontinent for long.
He waged a war against Kalinga state where he conquered and converted to Buddhism. He witnessed the war which he waged so as to conquer it, whereby it resulted to many people being deported and others died.
H ewent back to edicts and the Ashoka pillars where he send Buddhist monks to central Asia and Sri Lanka.
The purpose for the Buddhist was to establish monuments which marked the important sites for the life of Gautama Buddha.
the han dynasty standardized weights and measures
He was a ruler in third century BCE and he ruled all of North and parts of South India. He converted to Buddhism after he witness the distraction of Kalinga (Central India, on the Eastern shore) when we conquered it and he regretted the suffering he caused.