Correct answer: (c) 3 only
Explanation
- A
1 and 2
1 and 2. Incorrect. Vitasta is identified with the Jhelum, not the Chenab; Asikni is identified with the Chenab, not the Jhelum. Both pairs are reversed.
- B
3 and 4
3 and 4. Incorrect. Pair 3 (Parushni : Ravi) is correct, but pair 4 is not: the Beas corresponds to Vipasha/Vipas, not Yavyavati.
- C
3 only
3 only. Correct. Among the four pairs, only Parushni–Ravi is the standard ancient–modern match.
- D
4 only
4 only. Incorrect. Yavyavati : Beas is not the accepted identification used in the standard Rigvedic river map.
Summary. Official key is (c): only pair 3 (Parushni : Ravi) is correctly matched; the other three pairs misuse the standard Vitasta–Jhelum, Asikni–Chenab and Vipasha–Beas equations.