Here's a problem to solve: Phytoplankton are plant-like microscopic organisms that float in bodies of water such as the ocean. They take in carbon dioxide during the process of photosynthesis. What would most likely happen if the population of phytoplankton was destroyed?

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

- A: Sea temperatures would decrease.
 
- B: Greenhouse gases would increase.
 
- C: Atmospheric oxygen would increase.
 
- D: Sea levels would drastically decrease.
 