Which of the following is not a step of decomposition?

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

The food chain in which microbes split energy-rich compounds of the producer community is:

The rate of decomposition is $........$ in anaerobic and low-moisture conditions,and $........$ in warm and moist conditions,respectively.

Given below are two statements:
Statement $I:$
Decomposition is a process in which the detritus is degraded into simpler substances by microbes.
Statement $II:$
Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements,choose the correct answer from the options given below:

Bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called as . . . . . . .