The correct answer is A. Palkot.
The Nagbanshis were a Hindu dynasty that ruled over parts of eastern India from the 12th to the 16th centuries. They were originally from the Doisa region, but they shifted their capital to Palkot in the 13th century. Palkot is located in the present-day state of Jharkhand.
The Nagbanshis were a powerful dynasty and they ruled over a large territory. They were known for their military prowess and their patronage of the arts. They built many temples and palaces, and they also supported a number of scholars and poets.
The Nagbanshi dynasty came to an end in the 16th century, when they were overthrown by the Mughals. However, their legacy continues to this day, and they are still remembered as one of the most important dynasties in the history of eastern India.
Option B, Navratangarh, is incorrect because it is not a place that the Nagbanshis ever ruled over. Option C, Singhbhum, is incorrect because it is a region in Jharkhand, not a specific place. Option D, Delhi, is incorrect because the Nagbanshis never ruled over Delhi.