The Inefficiency of the Diaphragm in Patients with Lung Disease,who

The inefficiency of the diaphragm in patients with lung disease,who have greater pressure in the thoracic cavity than in the abdominal cavity,stems from which of the following?

A) The inability of the diaphragm to rebound into the thoracic cavity because of increased pressure
B) The inability of the diaphragm to overcome pressure in the abdomen
C) The ability of the intercostals to maintain greater pressure in the thoracic cavity
D) The ability of the abdominals to overcome the pressure created in the abdomen.