Correct Option: A

Rigvedic hymns mention several rivers. In the text Sindhu (or Indus), Saraswati(now lost) , the Gomati (modern Gomal), the Krumu(mordern Kurram) and the Kubha (modern Kabul) are mentioned. The most important river seems to be the Shindhu and its tributaries-Shutudri (Sutluj), Vipas (Beas), Parushni(Ravi), Asikni (chenab) and Vitasta(Jhelum).