Which of the following process promotes decomposition?

Correct option is D

Fragmentation is the detritus being eaten by earthworms and termites, leaching is when a part of water-soluble substances present in the fragmented and decomposing detritus go down in the soil horizon by percolating water and get precipitated as unavailable salts, and catabolism is carried out by saprotrophic bacteria. All three favour decomposition of detritus.