Which of the following represents an ascending order as per the size of…

Concept

Soil and sediment particles are classified into standard texture grades based on their grain diameter. These grades form a fixed, universally used size ranking, from the finest grains to the coarsest fragments: Clay is the finest, then Silt, then Sand, then Gravel, and larger Rock fragments are the coarsest of the group.

Application

"Ascending order" means listing the particles from the smallest diameter to the largest. Following the standard grade ranking above, the smallest-to-largest sequence is Clay, Silt, Sand, Gravel, Rock — which is exactly the sequence given in this option.

Cross-check — why the other sequences fail

• One sequence places the coarsest fragment first and a fine particle last, so it runs the opposite way at both ends of the listing rather than increasing steadily from fine to coarse.

• One sequence swaps only its first two terms, since clay grains are finer than silt grains, so a fine-to-coarse listing must start with clay, not silt.

• One sequence lists the fragments from the coarsest down to the finest — that is a descending (coarse-to-fine) order, the reverse of what "ascending" requires.

Result

The sequence genuinely arranged from smallest to largest particle size is Clay, Silt, Sand, Gravel, Rock.