Answer:
Option C.
Step-by-step explanation:
Used as crop fertilizer in the United States, is the right answer.
Biosolids are the nutrient-rich natural substances occurring from the processing of household sewage in a wastewater processing plant (for instance, managed sewage ooze). Biosolids are a propitious means, holding primary plant nutrients and unadulterated matter and are salvaged as a compost and soil amendment. biosolids material are used as crop fertilizer in the United States.