Diffusion of Gases in the Body Is Defined As

Diffusion of gases in the body is defined as:

A) The movement of charged protein carriers through the alveoli.
B) The movement of charged, hydrophilic ions through a nonpolar lipid layer.
C) The movement of an uncharged, hydrophobic solute through a lipid bilayer.
D) The passive movement of bound ions through cell membranes that results in the active transport of gases.