A customer suspects that one brand of cereal does not fill its boxes with the weight that is printed on the box. He decides to weigh several boxes to test his theory. Which of these methods will produce the most representative sample of the population of boxes containing this brand of cereal?

A). The customer randomly selects one grocery store, weighs one case of the cereal, and uses this weight to estimate the weight per box.

B). The customer randomly selects four grocery stores and weighs two boxes from each selected store.

C). The customer randomly selects one grocery store and weighs half the boxes of cereal.

D). The customer randomly selects one grocery store and weighs all the cereal boxes on one shelf.