The Stomach Can Be Considered a First Line of Defense

The stomach can be considered a first line of defense against microbial infections because

A) most microorganisms are susceptible to the antibiotics and alkaline pH present in the stomach.
B) most microorganisms are killed by the liver enzymes that are emptied into the stomach during a meal.
C) the stomach produces proteases, which attack the lipopolysaccharide cell wall of the organisms.
D) most microorganisms are susceptible to the acid pH of the stomach.