Which Finding Inspires the Belief That Inhalation Is Affected by Planning

Which finding inspires the belief that inhalation is affected by planning?

A) Timing of the activity of the diaphragm and external intercostals is affected by muscle feedback about the volume and change of volume of the lungs
B) Experienced singers regulate the amount of air they inhale and the speed with which they do so depending on the length and loudness of the phrase they are about to sing
C) The internal intercostals do not contract until the lungs have also begun to contract, thereby taking advantage of the inertia of lung contraction
D) None of the above