What Would Be an Expected Outcome of a Drop in Water

What would be an expected outcome of a drop in water temperature in a pond?

A) An increase in the metabolism of fish living in the pond
B) A decrease in the amount of O₂ in the water
C) Increased blood flow in the fish living in the pond
D) Decreased O₂ consumption of the fish living in the pond
E) An increase in body temperature of the fish living in the pond