Correct option is B
A – II (Podzolization): Leaching of Fe, Al, and humus in cool, humid climates.
B – III (Gleization): Happens under anaerobic, waterlogged conditions with iron reduction.
C – IV (Pedoturbation): Refers to the mixing of soil horizons by natural forces (organisms, frost, etc.).
D – I (Eluviation): Downward movement of dissolved or suspended materials.