Question

which of the following is more sustainable than using fertilizer? using composted leaves using thick rubber mulch injecting methane into the ground adding a lot of salts

Explanation:

Composted leaves are a natural, renewable resource. They can be easily obtained from garden waste and decompose over time, enriching the soil. In contrast, fertilizers often rely on non - renewable resources (like fossil fuels for synthetic fertilizers) and can have negative environmental impacts such as runoff pollution. Thick rubber mulch is made from non - biodegradable materials (rubber), injecting methane into the ground is not a common soil - enriching practice and may have negative environmental consequences (methane is a greenhouse gas), and adding a lot of salts can be harmful to plants and soil structure.

Answer:

A. using composted leaves