Mammals Use Several Strategies to Prevent Inhaled Pathogens from Entering

Mammals use several strategies to prevent inhaled pathogens from entering the body through the lungs;in this instance the

A) lung secretions create an acidic and inhospitable environment for pathogens.
B) mucus secreted into the bronchioles traps pathogens and is eventually removed by the action of the cilia lining the airway.
C) multiple layers of dead epithelial cells within the lungs that create a virtually impenetrable barrier to pathogen movement.
D) macrophages in the lungs produce the immobilizing toxins that paralyze pathogens before they can infect the body.