To order the provided soil particles by diameter, from largest to smallest, we must first establish the typical size ranges for each particle type:
- Clay: The smallest particles, typically under 0.002 mm in diameter.
- Silt: These particles are larger than clay, with diameters spanning 0.002 mm to 0.05 mm.
- Fine Sand: Particle diameters fall within the 0.05 mm to 0.2 mm range.
- Coarse Sand: The largest particles, generally measuring 0.2 mm to 2 mm in diameter.
Arranging the particles in descending order of size, based on these diameter ranges, yields the following sequence:
(D) Coarse sand
(C) Fine sand
(B) Silt
(A) Clay
The correct order from the listed options is: (D), (C), (B), (A)