Here's a problem to solve: One effect of ocean pollution is that it can reduce populations of phytoplankton and algae. The reduction of these populations might have which impact on an ecosystem?

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

- A: decreasing the level of carbon dioxide in the atmosphere
 
- B: decreasing the amount of oxygen being produced
 
- C: increasing the amount of marine sediments
 
- D: increasing salt-water fish populations
 