Step 1: Understanding composting.
Composting is the process of breaking down organic matter into nutrient-rich soil. This is typically done using biodegradable materials such as fruit peels, egg shells, tea leaves, and other organic waste.
Step 2: Analysis of the options.
- (a) Fruit peels: Suitable. Fruit peels are rich in organic matter and are great for composting.
- (b) Egg shells: Suitable. Egg shells break down easily and add valuable calcium to the compost.
- (c) Neem soap: Not suitable. Neem soap contains chemicals that could harm the beneficial microorganisms in composting, making it unsuitable.
- (d) Used tea leaves: Suitable. Used tea leaves are organic and can be easily composted.
Step 3: Conclusion.
Neem soap is not suitable for composting due to its chemical content, which can negatively impact the composting process.
Final Answer: Neem soap.