Concept:A fall in supply shifts the supply curve leftward, pushing the equilibrium price upward when demand is fixed.
Explanation:When supply decreases and demand stays the same, the supply curve moves to the left.
At the original price, quantity demanded now exceeds quantity supplied, creating a shortage.
This shortage forces buyers to compete, driving the price higher.
A new equilibrium is reached at a higher price.
Therefore, the equilibrium price rises.
Answer:D. rise