A customer suspects that one brand of oatmeal fills its containers with less oatmeal than the advertised weight. He visits three different grocery stores at random and weighs every 10th container of this brand of oatmeal on the shelves What is the sample in this study? A. The containers selected and weighed by the customer

B. All containers of oatmeal at the selected stores

C. All containers of the suspected brand of oatmeal stocked at the selected stores

D. All containers of the suspected brand of oatmeal​