Concept:Vermicompost is organic fertilizer produced by the decomposition of waste materials using specific worms, mainly earthworms.
Explanation:Vermicompost is made by feeding vegetable or food waste to worms like red wigglers and other earthworms.
The worms break down the waste, and their castings (worm manure) form the final compost.
This process is called vermiculture.
The resulting vermicompost is rich in nutrients and improves soil health.
Thus, the worms used are earthworms, not roundworms, amoeba, or plasmodium.
Answer:B. Earthworms