The correct answer is: C. Dharma Koop.
Dharma Koop is a well that was constructed by Yudhisthir after winning the Kurukshetra War. It is located in Kurukshetra, India. The well is said to be a symbol of justice and righteousness. It is also said to be a place where people can come to seek forgiveness for their sins.
The other options are incorrect. Chandra Koop is a well that is located in the city of Mathura, India. Surya Koop is a well that is located in the city of Varanasi, India. Mangal Koop is a well that is located in the city of Jaipur, India.
Chandra Koop is a well that is said to be the birthplace of the Hindu god Krishna. Surya Koop is a well that is said to be the birthplace of the Hindu god Vishnu. Mangal Koop is a well that is said to be the birthplace of the Hindu god Shiva.
All three of these wells are important religious sites for Hindus. However, they are not associated with Yudhisthir or the Kurukshetra War.