Final answer:
Phosphorus in the environment primarily comes from rocks, specifically phosphate rock. It is released through weathering, erosion, and decomposition.
Step-by-step explanation:
Phosphorus in the environment primarily comes from C. Rocks. Phosphate rock is a major source of phosphorus, and it is found in sedimentary rocks. When these rocks weather and break down over time, they release phosphorus into the environment. Phosphorus can also enter the environment through the erosion of rock minerals and the decomposition of organic matter.
Learn more about Phosphorus sources in the environment