The correct option is D Household discards
Non-biodegradable waste is defined as a substance that cannot be decomposed or dissolved naturally and acts as a source of pollution.
Biodegradable waste is a type of waste, typically originating from plant or animal sources, which may be degraded by other living organisms. Example: polythene bags, metal scraps, plastic etc.
Biodegradable waste can be commonly found in municipal solid waste as green waste, food waste, paper waste and biodegradable plastics. Other biodegradable wastes include household dicards. Hence correct option is d.