Correct option is C
Night soil refers to human excreta collected from latrines, especially from areas without a modern sewage system. It is traditionally used as manure in agriculture after proper composting or treatment to kill harmful pathogens.
It is rich in organic matter and nitrogen.
Requires safe composting/treatment before agricultural use.
Used in rural or traditional farming systems where sewage disposal is not modernized.
Information Booster:
City waste: Refers to municipal solid waste which may contain organic/inorganic materials.
Cattle excreta: Used to make farmyard manure (FYM).
Legume crops: Known for biological nitrogen fixation.