The correct answer is: A. Ashoka
Ashoka was the third emperor of the Mauryan Empire in India. He ruled from 272 to 232 BCE. He is known for his military conquests, as well as his Buddhist reforms.
Ajatasatru was the second emperor of the Magadha Empire in India. He ruled from 493 to 462 BCE. He is known for his conflict with his father, Bimbisara, and for his defeat of the Vajji confederacy.
Bindusara was the second emperor of the Mauryan Empire in India. He ruled from 321 to 272 BCE. He is known for his expansion of the Mauryan Empire.
Bimbisara was the first emperor of the Magadha Empire in India. He ruled from 544 to 493 BCE. He is known for his conflict with his son, Ajatasatru, and for his defeat of the Vajji confederacy.
Ashoka was the first ruler to embrace Buddhism. He converted to Buddhism after the Kalinga War, in which he conquered the Kalinga kingdom. After the war, Ashoka was deeply affected by the suffering he had caused, and he renounced violence and embraced Buddhism. He promoted Buddhism throughout his empire, and he built many Buddhist stupas and monasteries. He is also known for his Edicts of Ashoka, which are a series of inscriptions that he had carved on rocks and pillars throughout his empire. The Edicts of Ashoka provide insights into Ashoka’s religious beliefs, his policies, and his thoughts on morality.