Pick the most correct option to answer the following question.

Rolanda is growing tomato plants in her garden. She has created a compost pile and has been adding compost around her tomato plants to help fertilize them. Compost is solid waste in which organic material is broken down by microorganisms in the presence of oxygen to where it can be safely stored, handled, and applied to the environment. On what does Rolanda primarily rely in order for composting to work?

Options:

- A: producers

- B: consumers

- C: scavengers

- D: decomposers
D
"Decomposers", answer D, is the most correct option to complete this question. 
A "decomposer" is an organism that feeds on dead or decaying organisms and waste material in order for composting to work, which means it breaks down organic matter into simpler substances. Examples of decomposers are bacteria and fungi. All living things depend on producers (answer A), consumers (answer B) and scavengers (answer C)..