C- having children keep a daily calendar to track teeth-brushing at school.
Explanation:
all the other answer choices are not something you would usually do in a preschool class. A wouldn't be it because teacheres are not permitted to physically touching students. B also wouldn't be it because that is something one of the older grades would do, not 4 and 5 years old kids. Finally, D would'nt be the answer cause they wont learn much from a model. C would be the correct answer choice because it can help teach the kids their days of the week, which is whats taught in most preschools.
