Answer: d. Quantity increases, Price change is uncertain.
Step-by-step explanation:
Answer: d. Quantity increases, Price change is uncertain.
When the price of raspberries falls, blueberries become a more attractive substitute, and consumers will switch to buying more blueberries. When fertilizer costs fall, farmers can produce blueberries more cheaply, so they will likely increase the supply of blueberries. This will cause both the price and the quantity of blueberries to change, with the quantity increasing and the price remaining uncertain.