In the following groups of materials, which group (s) contains only non-biodegradable items?

i. Wood, paper, leather

ii. Polythene, detergent, PVC

iii. Plastic, detergent, grass

iv. Plastic, bakelite, DDT

Non-biodegradable materials are those materials which doesn’t break down due to biological process and remain as such in the environment for years. So, in above the non-biodegradable items are polythene, detergent, Polyvinylchloride (PVC), Plastic, Bakelite and DDT. So, in above question, ii and iv makes group of non-biodegradable items.