During Extreme Bouts of Exercise, Inspiration May Be Aided by (The)

During extreme bouts of exercise, inspiration may be aided by (the)

A) diaphragm and external and internal intercostal muscles.
B) rectus abdominis, external and internal oblique, and the transversus abdominis.
C) serratus anterior and levator scapulae.
D) intrinsic back muscles and the scalenus anterior and medius.
E) All of the answers are correct.