When you orally consume alcohol 10-15 percent is absorbed by your stomach while up to 90 percent is absorbed by your small intestine. This is the safe way to consume alcohol as it is filtered by your body before it hits your bloodstream. However any mucus membrane in your body can absorb alcohol which is why insertion and inhalation would also allow intoxication to occur. The problem with these methods is they are not filtered by your body and the alcohol goes directly to your bloodstream. With immersion your skin is not permeable and thus will not allow the alcohol to enter the body as your skins is not a mucus membrane. As a result the answer to this question is D.