At the Local Grocery Store, the Blueberry Jam Is Less

At the local grocery store, the blueberry jam is less expensive than last month. Which of the following can explain why blueberry jam costs less now?

A) Consumers are now purchasing fewer jars of blueberry jam as compared to other types of jam.
B) Blueberry farms are negatively affected by the weather, and blueberries are in short supply.
C) A research article reports on the benefits of eating blueberries.
D) The grocery store is experiencing a shortage of blueberry jam.