Correct option is C
✅ (c) Bundelkhand region: • Mar soil is a local name for black cotton soils found in Bundelkhand (Madhya Pradesh & Uttar Pradesh). • It is clayey, high in calcium carbonate, and suitable for cotton and pulses. • Known for cracking during summer and swelling in monsoon due to high clay content (montmorillonite).
❌ (a), (b), (d): • These regions may have alluvial or other soil types, but not typical mar soil.