During Pulmonary Ventilation,relaxation of the Diaphragm and External Intercostals _________

During pulmonary ventilation,relaxation of the diaphragm and external intercostals _________ and air flows out of the lungs.

A) increases the volume of the thoracic cavity
B) increases the pressure in the thoracic cavity
C) expands the rib cage
D) flattens the floor of the thoracic cavity
E) stimulates the phrenic nerve