Which one of the following processes during decomposition is correctly described?

1. A. (1) Fragmentation - Carried out by organisms such as earthworm
2. B. (2) Humification - Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
3. C. (3) Catabolism - Last step in the decomposition under fully anaerobic condition
4. D. (4) Leaching - Water soluble inorganic nutrients rise to the top layers of soil

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