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

Options

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