The correct answer is: D. Hisar Fort.
Balban was a Turkic slave who rose to become the Sultan of Delhi in 1266. He is known for his military prowess and for his efforts to consolidate the Delhi Sultanate.
Hisar Fort is a 13th-century fort located in the city of Hisar in Haryana, India. It was built by Balban in 1254. The fort is a large and imposing structure, with thick walls and towers. It is surrounded by a moat.
The fort has been used as a military base, a prison, and a royal palace. It is now a popular tourist destination.
The other options are incorrect because they were not built by Balban.
A. Tosham Fort is a 10th-century fort located in the town of Tosham in Haryana, India. It was built by the Chauhans.
B. Gopalgiri Fort is a 12th-century fort located in the town of Gopalgarh in Rajasthan, India. It was built by the Chauhans.
C. Hansi Fort is a 13th-century fort located in the town of Hansi in Haryana, India. It was built by the Tomars.