The correct answer is (a) Gujarat.
Dholavira is an archaeological site in Kutch district of Gujarat, India. It is one of the five largest Harappan sites, and is known for its well-preserved fortifications, water management system, and urban planning. The site was occupied from the late Harappan period (2600-1900 BCE) to the early Historic period (1900-1300 BCE).
The site is located on a small island in the Rann of Kutch, a large salt marsh in northwestern India. The island is surrounded by a moat and a fortified wall, and the site itself is divided into two parts: the citadel and the lower town. The citadel is located on the highest point of the island, and contains the most important buildings, including the Great Bath, the Assembly Hall, and the Palace. The lower town is located on the lower slopes of the island, and contains a variety of residential and commercial buildings.
Dholavira is a UNESCO World Heritage Site, and is one of the most important archaeological sites in India. The site provides valuable insights into the Harappan civilization, and its well-preserved remains are a testament to the sophistication of this ancient culture.
The other options are incorrect because they are not states in India where Dhoulavira is located.