The correct answer is: Brahmavrata.
Haryana was known as Brahmavrata in ancient times. It was a region of great religious and cultural importance. The Mahabharata, one of the most important Hindu epics, is set in Kurukshetra, which is located in Haryana. The region was also home to many important temples and monasteries.
Option A: Brahmavrata is a Sanskrit word that means “the vow of Brahma”. It is said that Brahma, the creator god, vowed to create a perfect land, and Haryana was the result of his vow.
Option B: Gujarat is a state in western India. It is not known to have been known as Brahmavrata in ancient times.
Option C: Kurukshetra is a region in Haryana. It is the site of the Kurukshetra War, which is described in the Mahabharata.
Option D: Delhi is the capital of India. It is not known to have been known as Brahmavrata in ancient times.