Answer:
The correct answer is option D.
Explanation:
An increase in the cost of fishing will lead to a decrease in the supply of fishes. This happens because the suppliers will be able to supply less at the same cost. Â
So the supply curve will move to the left. This leftward shift in the supply curve will cause the equilibrium price to increase and the equilibrium quantity to decrease. Â
All the other options would have caused the equilibrium quantity to increase either through increased demand or increased supply.