What Is the Rationale for Placing a Dyspneic Patient in Fowler's

What is the rationale for placing a dyspneic patient in Fowler's position?

A) Fowler's position allows maximum lung expansion.
B) Fowler's position increases use of accessory muscles.
C) Fowler's position relieves stress on the back and chest.
D) Fowler's position helps dilate diseased bronchioles.