Step 1: Understanding the Concept:
Upanayana is the most crucial 'Second Birth' ceremony for the twice-born (Dvija). It involves the investiture of the sacred thread and initiation into the study of the Vedas. Manu differentiates the age of initiation based on the Varna of the child, reflecting the different educational requirements and temperaments attributed to each group. A key point to remember is that these ages are calculated from Garbha (conception), not just from birth.
Step 2: Detailed Explanation:
In Manusmriti 2.36, the rule is explicitly laid out:
"garbhāṣṭame'bde kurvīta brāhmaṇasya upanāyanam |
garbhād ekādaśe rājño garbhāt tu dvādaśe viśaḥ ||"
This translates to:
1. Brahmin: 8th year from conception. (Option A)
2. Kshatriya (Rajan/King): 11th year from conception. (Option C)
3. Vaishya (Vish): 12th year from conception. (Option D)
The rationale provided by commentators like Medhatithi suggests that Brahmins, being focused on intellectual and spiritual pursuits, should start early. Kshatriyas, who focus on physical discipline and administration, are initiated at 11, and Vaishyas, focused on commerce and agriculture, at 12.
Manu also provides a 'maximum' limit (Apat-kala): if a Brahmin is not initiated by 16, a Kshatriya by 22, and a Vaishya by 24, they become 'Vratyas' (outcasts). Therefore, the 11th year is the standard 'ideal' time for a Kshatriya child to begin his formal Vedic and martial education.
Step 3: Final Answer:
The prescribed age for a Kshatriya's Upanayana is the 11th year from conception.