Here's a problem to solve: A euglena cell has a structure called an eyespot that detects light. A paramecium does not have an eyespot, and so it cannot detect light. Why doesn't a paramecium need an eyespot?

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

- A: A paramecium does not live where there is light.
 
- B: A paramecium does not photosynthesize its own food.
 
- C: A paramecium lives in shallower water than a euglena.
 
- D: A paramecium uses cilia instead of a flagellum to move.
 