You are explaining the causes of smokers cough to a c lient, including altered function of the cila in the ining of large respiratory passages. Which of these is

a. Smoking damages the cilla, rendering them unable to sweep mucus out of the respiratory passages, resulting in coughing.
b. Smoking causes the cilia to produce more mucus, resulting in coughing
c. Toxins in cigarette smoke irritate nerves under the clia, causing a cough.
d. Cigarette smoke causes an overgrowth of cilia, leading to cough