Gas Exchange in the Aquatic Salamander Known as the Mudpuppy

Gas exchange in the aquatic salamander known as the mudpuppy is correctly described as

A) active transport to move oxygen into the salamander from the water.
B) carrier-mediated transport to move oxygen into the salamander from the water.
C) facilitated diffusion of carbon dioxide from the salamander into the water.
D) simple diffusion of oxygen into the salamander from the water.
E) active transport of carbon dioxide from the salamander into the water.