Air trapping is a sign of premature airway closure and results in:

A)Movement of the equal pressure point at low lung volumes into the intrathoracic airways.
B)Movement of the equal pressure point at low lung volumes toward the alveolus.
C)Movement of the equal pressure point at low lung volumes toward the mouth.
D)No effect on the location of the equal pressure at low lung volumes.
E)Movement of the equal pressure point from airways with cartilage to airways without cartilage.