The correct answer is: A. Rajput kings.
Sirmaur was a princely state in India that was ruled by Rajput kings from the 11th century to 1948. The Rajputs are a warrior caste of Indian origin who are known for their bravery and chivalry. They have ruled over many parts of India throughout history, including Sirmaur.
The Rajputs of Sirmaur were a powerful and influential force in the region. They were known for their military prowess and their strong sense of honor. They were also patrons of the arts and literature.
The Rajputs of Sirmaur were eventually overthrown by the British in the 19th century. However, their legacy continues to this day. The Rajputs are still a proud and influential community in India.
The other options are incorrect. Option B is incorrect because Sirmaur was not ruled by Hindu kings. Option C is incorrect because Sirmaur was not ruled by Afghan kings. Option D is incorrect because Sirmaur was ruled by Rajput kings.