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

A)  Fragmentation-Carried out by   animisms such as earthworm

B)  Humification - Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fastrate

C)  Catabolism - Last step in the decomposition under fully anaerobic condition

D)  Leaching - Water soluble inorganic nutrients rise to the top layers of soil