As in Kalinga war ashoka attitude changed towards peaceful Ness it reason ashoka took buddhism religion. Ashoka consent rated welfare of people. He was constructed 8400 stupas. Rock edict XIII says about after victory of Kalinga war changed towards ashoka attitude towards dharma. Option c is correct

The correct answer is option 'C', Rock Edict XIII. Rock Edict XIII is the principal source of information on Ashoka's campaign against Kalinga.

Rock Edict XIII provides detailed information about Ashoka's conquest of Kalinga, a region in present-day Odisha, India. The edict is one of the several rock edicts issued by Ashoka, and it is inscribed on a rock face, conveying his message to the people.

Here is a detailed explanation of why Rock Edict XIII is the principal source of information on Ashoka's campaign against Kalinga:

1. Historical Context:
- Ashoka was an emperor of the Maurya dynasty who ruled a vast empire in the Indian subcontinent from 268 to 232 BCE.
- Before his conquest of Kalinga, Ashoka had waged several military campaigns to expand his empire.
- The Kalinga War, which took place around 261 BCE, was a significant event in Ashoka's reign and had a profound impact on his life and policies.

2. Content of Rock Edict XIII:
- Rock Edict XIII provides a detailed account of Ashoka's conquest of Kalinga and the aftermath of the war.
- It describes the massive loss of life, suffering, and devastation caused by the war, which deeply affected Ashoka.
- The edict expresses Ashoka's remorse and regret for the violence and bloodshed, and his commitment to promoting peace and non-violence.

3. Primary Source:
- Rock Edict XIII is considered a primary source of information because it was directly issued by Ashoka himself.
- It provides insights into Ashoka's personal thoughts, motivations, and the impact of the Kalinga War on his worldview.
- As a primary source, it holds significant historical value in understanding Ashoka's reign and the consequences of his military campaigns.

4. Reliability and Authenticity:
- Rock Edict XIII is widely accepted as an authentic and reliable source of information on Ashoka's campaign against Kalinga.
- It is inscribed on rocks across different regions of India, ensuring its preservation and authenticity over the centuries.
- The content of the edict is consistent with other historical accounts and corroborates the historical impact of the Kalinga War.

In conclusion, Rock Edict XIII is considered the principal source of information on Ashoka's campaign against Kalinga due to its detailed account of the war, Ashoka's personal reflections, its status as a primary source, and its reliability and authenticity.