The response that best explains the events that led to the spread of Buddhism during Asoka’s reign is:
Asoka took over Kalinga by force. Asoka rose to power through civil war. Asoka adopted Buddhism. Asoka became a just and compassionate ruler.
This sequence highlights how Asoka's violent conquest of Kalinga and the suffering it caused led him to adopt Buddhism, which in turn influenced his transformation into a ruler focused on compassion and justice, promoting the spread of Buddhist principles across his empire.