[2pt] 11. A fertilizer label "16-16-16" indicates the percentage by mass of N, P2O5,and K₂O.
Which statement is the most accurate interpretation for plant growth?

(A) A 16-16-16 fertilizer maximizes growth because all three nutrients are present in equal
amounts.

(B) The fertilizer provides equal amounts of elemental N, P, and K, so deficiencies are
impossible.

(C) Plant growth response depends on which nutrient is limiting; adding a balanced fertilizer
may not increase growth if another nutrient (e.g., Fe) is limiting.

(D) Phosphorus and potassium are not essential nutrients because they can be replaced by
nitrogen.

(E) The numbers indicate the soil pH required for optimal uptake.