Which of the following statements about the connection between above-ground plants and below-ground soil communities can be inferred from the passage? A. Because of the nature of the link between above- and below-ground communities, many soil communities are deficient in nutrients. B. The extent to which soil communities are dependent on above-ground plants is extremely variable from one soil community to another. C. Because different plants supply resources to soil communities in different ways, distinctive soil communities form under different plant communities.