Disposable plastic plates should not be used because
A. They are made up of materials with lightweight.
B. They are made up of toxic materials.
C. They are made up of biodegradable materials
D. They are made up of non- biodegradable materials.

Hint: A material that can be decomposed by microorganisms or decomposers and not be added to any type of pollution is called a biodegradable substance. Non-biodegradable wastes Waste that cannot be decomposed by biological processes. plastic comes under non- biodegradable substances. Non- biodegradables are not environment friendly. They are the major pollutant of the environment. Plastic is a major pollutant and nonbiodegradable that's why we don't use it.

Complete answer:
Let's discuss the option and find the correct answer.
A.They are made up of materials with lightweight: This option has no meaning related to the environment and has nothing to do with not using disposable plastic. hence option A is incorrect
B.They are made up of toxic materials: Disposable plastic is not made with toxic material. They are made of non-degradable material. Toxic means that the thing can have harmful effects after, but plastic is not like that. Hence option B is incorrect.
C.They are made up of biodegradable materials: If the plastic was made of biodegradable material, it would be better to dispose of it so that it could be recycled and used. Hence option C is incorrect.
D.They are made up of non- biodegradable materials: Disposable plastic plates should not be used because they are made of non-biodegradable materials like plastics, etc. The non-biodegradable materials cannot be broken down into harmless substances in nature, so they are a major pollutant of the environment.
Hence option D: They are made up of non- biodegradable materials is the correct answer.

Note: Non-biodegradable materials are often synthetic products like plastic, glass and batteries because they don't break down easily. If non-biodegradable waste is not disposed of properly they can cause pollution, block drains, and harms animals.