The correct answer is: B. Ballabhgarh
The Fort of Nahar Singh is situated in Ballabhgarh, Haryana, India. It was built in the 18th century by Nahar Singh, a Rajput ruler. The fort is a popular tourist destination and is known for its architecture and history.
Option A: Narnaul is a city in Haryana, India. It is located about 100 kilometers from Delhi. The city is known for its historical monuments, including the Narnaul Fort.
Option B: Ballabhgarh is a city in Haryana, India. It is located about 30 kilometers from Delhi. The city is known for its historical monuments, including the Fort of Nahar Singh.
Option C: Bhiwani is a city in Haryana, India. It is located about 150 kilometers from Delhi. The city is known for its historical monuments, including the Bhiwani Fort.
Option D: Kaithal is a city in Haryana, India. It is located about 200 kilometers from Delhi. The city is known for its historical monuments, including the Kaithal Fort.