An appropriate layering process for a compost pile generally involves alternating "green" materials (which are rich in nitrogen) and "brown" materials (which are rich in carbon), along with adding some soil and moisture to aid the composting process.
From the options provided, the best choice is:
- A layer of grass clippings, a layer of fruit scraps, some soil, and some water.
This combination includes both green (grass clippings, fruit scraps) and brown (soil) materials and ensures adequate moisture.