Dun valleys are associated with which Himalayan part?

Correct answer: Between Shiwalik and Lesser Himalaya

The direct answer is A: Dun valleys lie between the Shiwalik range and the Lesser Himalaya. In the Himalayan structure, the southernmost range is the Shiwalik, while the Lesser Himalaya, also called Himachal, lies farther north. Longitudinal valleys occur between these two ranges; they are called Duns. Step by step: identify the two Himalayan belts; locate the Shiwalik in the south and the Lesser Himalaya to its north; the valley between them is a Dun. Dehradun is the well-known example, though other Duns also occur. A is correct. B is wrong because the Thar and Aravalli are separate regions outside this Himalayan arrangement. C is wrong because Deccan and Malwa are plateau regions, not the ranges forming Dun valleys. D is wrong because Lakshadweep and Andaman are island groups, not adjacent Himalayan divisions. Memory cue: “Dun” means the valley between Shiwalik and Lesser Himalaya; remember Dehra-dun.