Option 1 (Wood, Grass, Plastic) contains both biodegradable and non-biodegradable items. Wood and grass are biodegradable as they can be broken down naturally by bacteria or other living organisms. However, plastic is non-biodegradable as it cannot be easily decomposed by natural processes.

Option 2 (Wood, Grass, Leather) contains only biodegradable items. Wood and grass are biodegradable, while leather is also biodegradable as it is made from animal hide and will break down over time.

Option 3 (Fruit peels, Lime juice, China clay cup) contains only biodegradable items. Fruit peels are biodegradable as they can decompose naturally. Lime juice is also biodegradable as it is made from organic materials, and the china clay cup is biodegradable as it is made from natural clay.

Option 4 (Lime juice, Grass, Polystyrene cup) contains both biodegradable and non-biodegradable items. Lime juice and grass are biodegradable, while the polystyrene cup is non-biodegradable as it is made from a synthetic material that does not easily decompose.

Based on the options provided, option 2 (Wood, Grass, Leather