Black soil is especially associated with which region?

Correct answer: Deccan Trap

The direct answer is A, Deccan Trap. Black soil is strongly associated with the basaltic lava rocks of the Deccan Trap region in the Peninsular Plateau. Over a long time, weathering of basalt produces clay-rich, dark soil, commonly called regur or black cotton soil. Step by step: ancient lava flows cooled to form basalt; basalt weathered and released fine mineral material; this material developed into deep black soil. Option A is correct because the Deccan Trap is the classic Indian region of black soil. Option B, the Ganga Plain, is mainly a vast alluvial region built by river deposits, so its characteristic soil is alluvial rather than specifically black soil. Option C, the Sundarbans, is a deltaic and tidal area known for muddy alluvium and mangrove vegetation. Option D, Ladakh, is a cold, high-altitude region with dry conditions and different thin soils. Black soil can occur beyond the Deccan, but among these options the Deccan Trap is the precise association. Memory cue: dark basalt lava gives dark regur soil.