The Upanishads were compiled around:
- A
- B
- C
- D
Solution & Step-by-step Explanation
The primary philosophical Upanishads, which critique outer ritualism and elaborate on the spiritual concepts of Atman and Brahman, were composed and structured towards the close of the later Vedic age. This puts their core compilation timeframe near , predominantly across the ancient regional boundaries of Panchala and Videha.