The correct answer is (c). The Rigveda is an ancient Indian collection of Vedic Sanskrit hymns. It is one of the four sacred texts of Hinduism, and is the oldest Veda. The Rigveda is divided into ten books, or mandalas, and contains over 1,000 hymns. The hymns are addressed to a variety of deities, including Indra, Agni, and Soma. The Rigveda is an important source of information about the early history of India, and its language and culture.
The rivers Kubha and Kramu are mentioned in the Rigveda as being located in the land of the Aryans. The Aryans were a group of Indo-European peoples who migrated to India from Central Asia. The Rigveda suggests that the Aryans were familiar with the rivers Kubha and Kramu, which are located in Afghanistan. This suggests that the Aryans had contact with Afghanistan, and may have even lived there for a time.
The other options are incorrect. The Asikni is a river in India, and the Parushni is a river in Pakistan. The Vipas and Sutudri are rivers in India and Pakistan. These rivers are not mentioned in the Rigveda in connection with Afghanistan.