Concept: The above-given statement is true.

• The fish's internal organs are found in its gills. Blood capillaries line the gills, which enable them to take up oxygen dissolved in water. The dissolved oxygen is carried into the fish as the water enters through its mouth, while the carbon dioxide is expelled.
• When fish are removed from the water, their oxygen supply is diminished because they are unable to use the oxygen in the air to breathe. They will therefore perish if removed from the water.
• Gills may take in the dissolved oxygen in the water because they are equipped with blood capillaries. Fish that are taken out of the water perish because they cannot breathe and breathe with enough oxygen since their lungs are not available.

Hence, option A is the correct answer.