Which of the Following Is NOT True of the Phosphorus

Which of the following is NOT true of the phosphorus cycle?

A) phosphorus never enters the atmosphere
B) phosphate only becomes available when a geological upheaval exposes sedimentary rocks
C) phosphate is often a limiting nutrient in most ecosystems
D) phosphate detergents are a major source of eutrophication
E) the phosphorous cycle is not affected by human activities