Match List-I with List-II and select the correct answer using the codes given…

Concept — A List-I to List-II matching item is settled entry by entry, not by guessing at the pattern of the code sequence. For each entry, recall the single established fact the item turns on — here the city in which the institution has its headquarters or main campus, as fixed by its founding charter and its official records — and fix that pairing on its own evidence. Because the matching is one-to-one, every city in List-II is used exactly once, which supplies a built-in check: settle the pairings you are surest of first, let the one-to-one constraint narrow what is left, and then read the codes off in the order a, b, c, d.

Application — Taking each institution in turn, with its established location:

1. Central Arid Zone Institute: the Indian Council of Agricultural Research institute for arid-zone (desert) research, set up in 1959. It stands in the heart of the Thar desert region at Jodhpur, Rajasthan, so it takes code (iv).

2. Space Application Centre: the ISRO centre that develops the applications side of space technology, including communication, meteorology and remote-sensing payloads. It works from Ahmedabad, Gujarat, so it takes code (iii).

3. Indian Institute of Public Administration: the autonomous body founded in 1954 for training and research in public administration for civil servants. It functions from Indraprastha Estate at the seat of the Union Government, New Delhi, so it takes code (ii).

4. Headquarters of Indian Science Congress: the Indian Science Congress Association was founded in 1914 and keeps its head office in its founding city, Kolkata, so it takes code (i).

Cross-check — Each of the four cities is used exactly once, so the mapping is a valid one-to-one matching, with no city left unused and none assigned twice. The four pairings are also mutually consistent with the documented profile of each body: the Indian Council of Agricultural Research institute for desert research in the arid belt of Rajasthan (Central Arid Zone Institute); the Indian Space Research Organisation applications campus in Gujarat (Space Application Centre); a civil-service training and research institute at the national capital (Indian Institute of Public Administration); and a learned society founded in 1914 that still keeps its office in its founding city in West Bengal (headquarters of Indian Science Congress).

Reading the codes for (a), (b), (c) and (d) in that order therefore gives (iv), (iii), (ii), (i).