Smoking Paralyzes the Cilia Lining the Respiratory System

Smoking paralyzes the cilia lining the respiratory system. This damages the lungs because

A) the cilia produce the mucus that covers the alveoli and without the mucus, gases cannot diffuse into the capillaries surrounding the alveoli.
B) when the cilia cannot move, bacteria and particles cannot be swept out of the respiratory system before damaging the walls of the alveoli.
C) when paralyzed, the cilia cannot prevent backflow from the heart into the lungs. The resulting flow of high-pressure blood into the lungs ruptures capillaries.
D) cilia are the gas exchange structures of the lungs and when they are paralyzed, air cannot move in and out of the lungs.

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