Which of the following is not a proper description of decomposition process?

Given below are two statements:

Statement $\mathrm{I}$: Decomposition is a process in which the detritus is degraded into simpler substances by microbes.

Statement $\mathrm{II}$: Decomposition is faster if the detritus is rich in lignin and chitin.

In light of the above statements, choose the correct answer from the options given below:

Identify the correct statement:

A. Detrivores perform fragmentation.

B. The humus is further degraded by some microbes during mineralisation.

C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.

D. The detritus food chain begins with living organism.

E. Earthworms break down detritus into smaller particles by a process called catabolism.

Choose the correct answer from the options given below:

Select the correct option for the process of decomposition.

a = Fragmentation

b = Catabolism

c = Leaching