Which one of the following processes during decomposition is correctly described?
A. Fragmentation - Carried out by organisms such as earthworm
B. Humification - Leads to the accumulation of a dark coloured sustance humus, which resistant to microbial action at a very fast rate
C. Carabolism - Last step in the decomposition under fully anaerobic condition
D. Leaching - Water soluble inorganic nutrients rise to the top layers of soil
