Ritchi archipelago is a part of:

 a) Lakshadweep
 b) Indonesia
 c) Andaman and Nicobar
 d) Philippines

TNPSC Jailor-2016

Andaman and Nicobar. Ritchie's Archipelago is a cluster of smaller islands which lie some 25–30 km east of Great Andaman, the main island group of the Andaman Islands.