Final answer:
The answer to which of the following is a Decomposer is C. Worm, as worms are detritivores that break down organic matter and contribute to nutrient cycling in ecosystems.
Step-by-step explanation:
The correct answer to which of the following is a Decomposer is C. Worm. Decomposers are organisms that break down the remains of dead organisms and other organic wastes, such as feces, and in the process, they release simple inorganic molecules back to the environment. Forest decomposers like worms play a crucial role in recycling nutrients and are integral to ecosystem health. Detritivores are a type of decomposer that ingest and digest detritus, and examples of terrestrial detritivores include earthworms. These organisms help to decompose organic matter and turn it into soil nutrients, which is fundamental for plant growth and maintaining the nutrient cycle.