The correct answer is: B. Rakhigarhi
Rakhigarhi is an archaeological site in Hisar district, Haryana, India. It is one of the largest Harappan sites discovered so far, covering an area of over 350 hectares (865 acres). The site was first excavated in 1963 by the Archaeological Survey of India (ASI), and further excavations have been conducted since then.
Rakhigarhi was a major urban center during the Harappan period, and it is estimated to have had a population of over 30,000 people. The site is well-preserved, and it has yielded a wealth of artifacts, including pottery, seals, and beads.
Rakhigarhi is an important site for understanding the Harappan civilization. It provides evidence of the sophistication of Harappan culture, and it helps us to understand the development of urbanism in the Indus Valley.
The other options are incorrect because they are not as old as Rakhigarhi. Bhadana is a Harappan site that is dated to the Mature Harappan period (2600-1900 BCE). Banawali is a Harappan site that is dated to the Early Harappan period (3300-2600 BCE). Kunal is a Harappan site that is dated to the Late Harappan period (1900-1300 BCE).