Intentionally Supplementing Nitrogen into a Monoculture Like a Cornfield Has

Intentionally supplementing nitrogen into a monoculture like a cornfield has predictable and desirable results. Is the same true when added to a system as complex as a community?

A) Yes; both primary production and species diversity increase.
B) Yes; primary production decreases but species diversity increases.
C) No; both primary production and species diversity decrease.
D) No; primary production increases but species diversity decreases.