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:

• A
  Both Statement $I$ and Statement $II$ are incorrect
• B
  Statement $I$ is correct but Statement $II$ is incorrect
• C
  Statement $I$ is incorrect but Statement $II$ is correct
• D
  Both Statement $I$ and Statement $II$ are correct