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