Here's a problem to solve: The stem is an important part of many plants. Which of the following is most similar to the role performed by the stem of a plant?

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

- A: an anchor holding a boat in place
 
- B: a snack company producing energy bars
 
- C: a colorful sign attracting people into a store
 
- D: an elevator transporting supplies from one floor to another
 