Which of the Following Best Explains Why You Cannot Use

Which of the following best explains why you cannot use the price of rolled oats at a local supermarket as the competitive market value of rolled oats?

A) The posted prices of oats can vary widely between grocery stores, even within the same local area.
B) Grocery stores typically sell oats in different packaging, which results in different prices within the same store.
C) Grocery stores mark up the prices of their oats to make a profit.
D) You can buy the oats at the price posted by the store, but the store will not buy oats from you for the same price.