Correct Answer:
Option C - Tha Aitareya Upanishad belongs to fourth, fifth and sixth chapters of the second book of Aitareya Aranyaka of the Rigveda. Rigveda is also a part of Vedtrayi i.e. a group of Rigveda, Samveda and Yajurveda.
C. Tha Aitareya Upanishad belongs to fourth, fifth and sixth chapters of the second book of Aitareya Aranyaka of the Rigveda. Rigveda is also a part of Vedtrayi i.e. a group of Rigveda, Samveda and Yajurveda.