Nitrogen and Phosphorus Are Referred to as Macronutrients Because _____________

Nitrogen and phosphorus are referred to as macronutrients because _____________.

A) they are needed to manufacture large biomolecules
B) their cycles have larger reservoirs than those of micronutrients
C) they are required in large amounts for organisms to survive
D) they are needed by large organisms
E) they are larger than other nutrients needed by plants