Who constructed the Gopalgir Fort on the border of Delhi-Gurugram?

The correct answer is: A. Razia Sultana

Razia Sultana was the first and only female ruler of the Delhi Sultanate. She was the daughter of Iltutmish, the second Sultan of Delhi. Razia ascended to the throne in 1236 AD after the death of her father. She was a capable ruler and is credited with expanding the Delhi Sultanate. She was also a patron of the arts and literature.

The Gopalgir Fort was built by Razia Sultana in 1236 AD. It is located on the border of Delhi and Gurugram. The fort is a rectangular structure with four towers at each corner. It is made of red sandstone and is in a good state of preservation.

The other options are incorrect because:

• Iltutmish was the second Sultan of Delhi and the father of Razia Sultana. He did not build the Gopalgir Fort.
• Qutb-ud-din Aibak was the first Sultan of Delhi. He did not build the Gopalgir Fort.
• Balban was the fifth Sultan of Delhi. He did not build the Gopalgir Fort.