Which of the following process during decomposition is correctly described?

Options

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