Step 1: Understanding the hierarchy of the caste system.
Hindu society's traditional caste system comprises four primary Varnas: - Brahman (C): Scholars and priests, responsible for education and spiritual guidance. - Ksatriya (B): Warriors and rulers, responsible for defense and administration. - Vaishya (A): Merchants and farmers, responsible for commerce and agriculture. - Shudra (D): Laborers and service providers, responsible for supporting the upper Varnas.
Step 2: Conclusion. The established hierarchical sequence is C, B, A, D.
Final Answer: \[ \boxed{\text{The correct answer is 2. C, B, A, D.}} \]