Respuesta :
the answer is D my teacher just went over this hope this helps you
The sample for the elementary school teacher in this situation is the materials list for every third experiment.
What is the sample in this situation?
A sample is a smaller group of the population. A sample is needed because it might not be possible or cheap to access the whole population.
It might take a long time for the teacher to read all the material lists, so she takes a sample of the material lists by only reading a third of the material lists.
To learn more about sample, please check: https://brainly.com/question/18521835