Question Statement:
Mole drainage involves creating unlined underground cylindrical channels by pulling a torpedo-shaped mole plough. Mole drains remain stable and functional primarily in:
Options:
- (A) Coarse sandy soils
- (B) Heavy cohesive clay soils with high plasticity
- (C) Non-cohesive gravelly soils
- (D) Silt loam soils with low clay content