During Snack Time, Children Help Themselves to the Vegetables and Dip

During snack time, children help themselves to the vegetables and dip. They are expected to take up to five of each vegetable. Which of the following is the best strategy to teach this?

A) Teachers count the number of vegetables.
B) A visual cue that includes the number five is placed next to the platter.
C) Vegetables are pre-sorted into individual serving sizes.
D) Children who take too many are asked to share with others.