The Figure Below Illustrates the Respiratory Surface of an Animal

The figure below illustrates the respiratory surface of an animal relative to its body surface.
Would you expect this respiratory surface to be found in an aquatic or terrestrial animal?

A) Aquatic; having the respiratory surfaces inside the body saves energy since water is less dense than air and can therefore be more easily moved through an internal respiratory organ.
B) Aquatic; having an external respiratory surface allows the animal to create a larger surface area for gas exchange.
C) Terrestrial; by having the respiratory surface inside the body, terrestrial animals reduce water loss.
D) Terrestrial; having the respiratory surfaces inside the body prevents gases other than oxygen from entering the body.