Put the events in the proper order. asoka converts to buddhism due to suffering in kalinga. asoka struggles with brothers for throne, then kills brothers and wins throne. asoka creates pillars to tell subjects of three morals laws and makes kingdom a better place to live. asoka holds power, then attacks kalinga to extend kingdom. asoka regrets bloodshed in kalinga.

I hope this helps, this is the actions that Asoka did. In this, you can find your answers. :)

 His vigorous patronage of Buddhism furthered the expansion of Buddhism . Following his successful but bloody conquest of the Kalinga, Ashoka renounced armed conquest and adopted a policy that he called "conquest by dharma" (i.e., by principles of right life) .  In order to gain wide publicity for his teachings and his work, Ashoka made them known by means of oral announcements and by engravings on rocks and pillars at suitable sites . These inscriptions - known as the rock edicts or the Pillars of Ashoka - contain statements regarding his thoughts and actions and provide information on his life and acts . The sufferings inflicted on the defeated people at the Battle of Kalinga moved Ashoka to such remorse that he renounced armed conquests .  It was at this time that he came in contact with Buddhism and adopted it . Ashoka repeatedly declared that he understood dharma to be the energetic practice of the sociomoral virtues of honesty, truthfulness, compassion, mercifulness, benevolence, nonviolence, considerate behavior toward all, "little sin and many good deeds," nonextravagance, nonacquisitiveness, and noninjury to animals . Toward all religious sects he adopted a policy of respect and guaranteed them full freedom to live according to their own principles . Moreover, he encouraged religious toleration .  Among his works of public utility were the founding of hospitals for men and animals and the supplying of medicines, and the planting of roadside trees and groves, digging of wells, and construction of watering sheds and rest houses . Orders were also issued for preventing cruelty to animals .  With the death of Ashoka, the Mauryan Empire disintegrated and his work was discontinued . Most enduring were Ashoka's services to Buddhism . He built a number of stupas (commemorative Buddhist burial mounds) and monasteries and erected pillars on which he ordered inscribed his understanding of religious doctrines . The Sinhalese chronicle Mahavamsa says that when the order decided to send preaching missions abroad, Ashoka helped them enthusiastically and sent his own son and daughter as missionaries to Sri Lanka . It is as a result of Ashoka's patronage that Buddhism, which until then was a small sect confined to particular localities, spread throughout India and subsequently beyond the frontiers of the country.

it should be d or b but i'm sure it's d