The correct answer is: A. Singh kings
The Dhalbhum area of Singbhum was ruled by the Singh kings. The Singh kings were a Hindu dynasty that ruled over the Dhalbhum area from the 12th to the 16th centuries. They were a powerful dynasty and their rule was marked by peace and prosperity. The Singh kings were known for their patronage of the arts and sciences. They built many temples and palaces, and they also supported education and scholarship. The Singh kings were eventually overthrown by the Mughals in the 16th century, but their legacy continues to this day.
The other options are incorrect. Option B, Dhal kings, is incorrect because there is no evidence that the Dhal kings ever ruled over the Dhalbhum area. Option C, Rakshel kings, is incorrect because the Rakshel kings were a tribal group that lived in the Dhalbhum area, but they did not rule over it. Option D, None of these, is incorrect because the Singh kings did rule over the Dhalbhum area.