Why Do Areas of Upwelling Tend to Have Large and Diverse

Why do areas of upwelling tend to have large and diverse populations of organisms?

A) Upwelling lowers the level of oxygen in the water.
B) Upwelling mixes deep- ocean fresh water with salt water from rivers.
C) Upwelling brings aphotic organisms to the ocean surface.
D) Upwelling brings nutrient- rich water up from the ocean depths.
E) Upwelling moves dinoflagellates to the aphotic zone.