Pair 1 is incorrectly matched: The ancient Rigvedic name for the modern Jhelum river is Vitasta, not Chenab. Pair 2 is incorrectly matched: The ancient Rigvedic name for the modern Chenab river is Asikni, which translates to "dark-colored waters." Pair 3 is correctly matched: The ancient Rigvedic name for the modern Ravi river is Parushni. It is historically significant as the site of the "Battle of the Ten Kings" (Dasarajna) fought by King Sudas, as mentioned in the Rigveda. Pair 4 is incorrectly matched: The ancient Rigvedic name for the modern Beas river is Vipasha. Yavyavati is another ancient river mentioned in the Rigveda, often associated by historians with the Zhob river in Balochistan or the ancient Drishadvati river, but it is definitively not the Beas. Therefore, only pair 3 is correctly matched, making the correct option C.