Step 1: Upanishad Association
Each Veda has its corresponding Upanishad:
- Rigveda is associated with the Aitareyopanishad.
- Samaveda is associated with the Chhandogyopanishad.
- Yajurveda is associated with the Ishavasyopanishad.
- Atharvaveda is associated with the Mandukyopanishad.
Step 2: Correct Order by Association
The Upanishads, ordered by their Vedic association, are: B. Aitareyopanishad (Rigveda), A. Chhandogyopanishad (Samaveda), C. Ishavasyopanishad (Yajurveda), D. Mandukyopanishad (Atharvaveda).
Step 3: Identifying the Correct Sequence
While other arrangements exist, the definitive logical sequence is B, A, C, D.
Step 4: Final Determination
Therefore, the correct sequence of Upanishads is B, A, C, D.