Here's a problem to solve: Charisma has a goldfish she keeps in a tank. She planted several underwater plants in the bottom of the tank. How are the goldfish and the plants in the tank similar?

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

- A: Both add oxygen to the water.
 
- B: Both perform photosynthesis.
 
- C: Both are made up of cells.
 
- D: Both eat food.
 