Option 3, which matches Parushni with Ravi, is correct because Parushni is indeed the ancient name for the Ravi River, as documented in historical texts and geographical studies of ancient India. The other pairings are incorrect: Vitasta refers to the Jhelum River, Asikni to the Chenab River, and Yavyavati to the Beas River. Understanding these correspondences is crucial for UPSC candidates as it emphasizes the historical continuity of geographical features and helps in comprehending the cultural significance of rivers in the subcontinent's ancient civilizations.