Correct answer: C. Merchant organization of a town
Explanation: Direct answer: Option C, the merchant organization of a town. Chola inscriptions describe different local institutions with different functions. Nagaram was associated with an urban settlement and its organized commercial groups, especially merchants and traders. These groups could participate in local economic and administrative matters. This term must be distinguished from other important Chola institutions. Ur generally referred to the assembly of an ordinary village, while Sabha or Mahasabha was the assembly of Brahmana landholders in a Brahmadeya village. Nagaram was connected with the town and its commercial community. Option C is correct because it directly identifies the urban merchant organization. Option A is wrong because a monastic order is connected with religious institutions, not the usual meaning of Nagaram in Chola local administration. Option B is wrong because Nagaram was not a military unit. Option D is wrong because it did not mean the royal household or palace family. The clue is the word nagara, meaning town or urban centre. Memory cue: Ur = village assembly, Sabha = Brahmana assembly, Nagaram = town merchants.