Identify the processes $P, Q,$ and $R$ in the following descriptions:
$I -$ The process of breaking down detritus into smaller particles $- P$
$II -$ Bacterial and fungal enzymes degrade detritus into simpler inorganic substances $- Q$
$III -$ Water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts $- R$
Select the correct option for $P, Q,$ and $R$.

• A
  Catabolism,Fragmentation,Leaching
• B
  Fragmentation,Catabolism,Leaching
• C
  Anabolism,Fragmentation,Leaching
• D
  Fragmentation,Anabolism,Leaching