A 65-year-old woman with a smoking history of 2 packs/day for 30 years has received a diagnosis of chronic obstructive lung disease.She is obviously using her accessory respiratory muscles for breathing; this behavior is caused by:

A)Decreased work of breathing as a result of airflow obstruction.
B)Increased work of breathing as a result of a dysfunction in the neuromuscular junction.
C)Increased work of breathing as a result of airflow obstruction that necessitates active contraction of the expiratory muscles.
D)Abnormal breathing pattern.
E)Increased work of breathing as a result of airflow obstruction that necessitates active contraction of the inspiratory muscles.