A shopper wants to determine which grocery store provides the best prices for the products the shopper purchased most often.The purchases made at each grocery store should be selected using which method?

Group of answer choices

A systematic sample from a random list of all items sold at each store

A convenience sample based on the layout of each store

Random sample of the items that are on sale at each store

Random sample of the items the shopper purchases on each day of the week

A census of the items purchased most often