Concept:Flour is an input used to make bread, so a rise in its price increases the cost of production.
Explanation:When production cost rises, producers earn less profit at every price of bread.
They are less willing to supply the same quantity as before.
This causes the quantity supplied at each price to fall.
Therefore, the supply curve for bread shifts to the left.
The demand curve is not affected because consumer preferences have not changed.
Answer:B. supply curve will shift to the left