If a question gives clues of cotton, black soil, and lava plateau, which region is correct?

Correct answer: Deccan Plateau

The governing concept is the relationship between parent rock, soil formation and regional agriculture. Much of the Deccan Plateau is covered by basaltic lava flows known as the Deccan Traps. Weathering of these basaltic rocks has produced deep black soil, also called regur, which retains moisture and is especially suitable for cotton cultivation. The combination of cotton, black soil and a lava-built plateau therefore identifies option A, the Deccan Plateau. The Meghalaya Plateau has different rocks and a northeastern setting. The Ganga Plain is mainly an alluvial depositional plain, not a lava plateau. Ladakh is a cold, high-altitude plateau where the climate and soils do not support the described cotton-growing association. Thus the three clues work together to select A.