Earthworms are a species of worms that lives in moist soil along with other organisms like tiny insects and bacteria. Earthworms obtain water and nutrients by eating dead plant material found in the soil. Earthworms also release waste materials that help enrich the soil. Based on this information, which sentence is correct?

The earthworms are an environment.
The earthworms are a community.
Soil is the earthworm’s habitat.
Soil is the earthworm’s niche.