Answer:
The correct option is D.
Step-by-step explanation:
The chronic obstructive bronchitis is characterized by irreversible and persistent flow obstruction, followed by bronchial inflammation, in response to harmful particles or gases (biomass) exposure. There is an increase in the secretory glands and cells in the submucosa, which causes chronic mucus hypersecretion, which leads to the overproduction of mucus and the production of a particularly thick mucus, aggravated by a bad and inefficient ciliary cleaning function and a cough not treated properly, it weakens the respiratory muscles. The damage in chronic bronchitis is due to excess mucus production, with mucoiciliary dysfunction, secondary to persistent bronchial inflammation. The main responsible for this excessive mucus are the overproduction of secretion originated in the cells and the decrease in the elimination of said mucus.