Due to increasing air-borne allergens a pollutants, many people in urban areas a suffering from respiratory disorder cause wheezing due to:

Options

A. reduction in the secretion of surfactant, pneumocytes.
B. benign growth on mucous lining of nasal cavity.
C. inflammation of bronchi and bronchioles
D. proliferation of fibrous tissues and damage of the alveolar walls.

Answer

C