The correct answer is option 'C' - Ashoka.

Explanation:
- The inscription mentioned in the question was found in Kandahar, present-day Afghanistan, and it dates back to about 2250 years ago.
- This inscription was ordered to be written by a ruler named Ashoka.
- Ashoka was an emperor of the Maurya Dynasty in ancient India, who ruled from 268 to 232 BCE.
- He is known for his conversion to Buddhism and his efforts to spread the teachings of Buddha throughout his empire.
- Ashoka's inscriptions, known as the Edicts of Ashoka, were written in various parts of his empire and were meant to convey his policies and principles to his subjects.
- These inscriptions were written in various languages including Prakrit, Greek, and Aramaic, and were carved on rocks and pillars.
- The inscription found in Kandahar is one such example of Ashoka's edicts.

Importance of Ashoka's Inscriptions:
- Ashoka's edicts are of great historical significance as they provide valuable information about the administration, social policies, and religious beliefs of the Mauryan Empire.
- They also give insights into Ashoka's personal transformation after the brutal Kalinga War, which made him embrace Buddhism and adopt a policy of non-violence.
- These inscriptions also reveal Ashoka's efforts to promote Dhamma (righteousness) and moral values among his subjects.
- They address various aspects of governance, including the welfare of the people, ethical conduct, religious tolerance, and animal welfare.
- Ashoka's inscriptions have been found in different parts of the Indian subcontinent as well as in neighboring regions like Afghanistan and Pakistan, indicating the extent of his empire's influence.

Conclusion:
- The inscription found in Kandahar, Afghanistan, dating back 2250 years ago, was ordered to be written by the ruler Ashoka.
- Ashoka's inscriptions, known as the Edicts of Ashoka, are of significant historical importance as they provide insights into the administration, policies, and beliefs of the Mauryan Empire, as well as Ashoka's personal transformation and his efforts to promote moral values and righteousness among his subjects.