Here's a problem to solve: Which of the following events along the west coast of the United States provides direct evidence that upwelling brings nutrient-rich waters to the surface?

Among the 4 following options, which is the correct answer?

- A: an increase in fisheries production during upwelling
 
- B: a decrease in larval fish populations during upwelling
 
- C: an increase in algae and phytoplankton during upwelling
 
- D: a decrease in surface water temperatures during upwelling
 