Option c is the correct answer. King Kharavela is related to the Hathigumpha inscription. The Hathigumpha inscription, found in the Udayagiri hills near Bhubaneswar, Odisha, is attributed to Jain king Kharavela of the Kalinga kingdom. Dated between the 2nd century BCE and the 1st century CE, it provides insights into Kharavela's biographical sketch, religious values, infrastructure projects, military endeavors, society, and culture. The inscription is considered a significant historical source for the region.