Correct option is D
✅ Soil Particle Size Classification (as per USDA & ISSS):
| Soil Particle Type |
Diameter Range |
| Sand |
0.05 mm to 2.00 mm |
| Silt |
0.002 mm to 0.05 mm |
| Clay |
< 0.002 mm |
Due to their size, they:
Have high water retention capacity
Exhibit plasticity and swelling
Possess high surface area and CEC (Cation Exchange Capacity)
Why Others Are Incorrect:
❌ > 2 mm → Refers to gravel/stones
❌ 0.2 to 2 mm → Sand
❌ 0.002 to 0.02 mm → Silt
✔️ Correct clay size: Less than 0.002 mm
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