The correct answer is option 2: Tomars. The city of Dhillika, which is now known as Delhi, was founded by the Tomar dynasty. The Tomars were a Rajput clan who ruled over the region in the 12th century. They established the city of Dhillika as their capital and built several prominent structures, including the Lal Kot fort. The Tomars held control of the city until they were overthrown by the Chauhans in the late 12th century. While the Chauhans are also prominent in the history of Delhi, they were not responsible for founding the city. Therefore, option 1 (Chauhans), option 3 (Pawars), and option 4 (Pratiharas) are incorrect.