Step 1: Concept
Upnayan Samskara, also known as Upanayana or thread ceremony, is a significant ritual marking the beginning of formal education and spiritual initiation.
Step 2: Meaning
Upnayan Samskara involves the tying of a sacred thread called Yajnopavita, symbolizing the wearer's eligibility to study Vedic texts and participate in certain religious rituals.
Step 3: Analysis
Assertion (A) states Upnayan Samskara was conducted at specific ages: 8 for Brahmins, 11 for Kshatriyas, 12 for Vaishyas, and 15 for Shudras. However, Upanayana was traditionally performed for the first three varnas (Brahmins, Kshatriyas, Vaishyas) only — not for Shudras. Additionally, the ages specified may not match all traditional sources. Reason (R) states Upnayan Samskara marked the transition from childhood and initiation into education. This is generally accurate — it does mark a formal beginning of Vedic education (Gurukul system), though the description "infancy to childhood" is imprecise. Overall, Assertion (A) contains inaccuracies about the inclusion of Shudras, while Reason (R) is more accurately stated.
Step 4: Conclusion
Assertion (A) contains factual errors while Reason (R) is correct.
Final Answer: (D)