Fish Don't Live Very Long in Water That Has Just $\mathrm { O } _ { 2 }$

Fish don't live very long in water that has just been boiled and brought back to room temperature.Suggest why.

A) There is now a higher concentration of dissolved C $\mathrm { O } _ { 2 }$ in the water.
B) The nutrients in the water have been destroyed.
C) Since some of the water was evaporated while boiling,the salts in the water are now more concentrated.This has a negative effect on the fish.
D) The boiling process removes the air that was dissolved in the water.Upon cooling the water is void of its usual air content,hence,the fish drown.