Here's a problem to solve: Sam was listing the differences between a euglena and a paramecium. Which characteristic should not be on Sam's list?

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

- A: only the euglena can respond to light
 
- B: only the euglena have a definite shape
 
- C: only the euglena use a flagellum to move
 
- D: only the euglena can make their own food
 