Which of the Following Is Not a True Statement

Multiple Choice

Which of the following is not a true statement?

A) When the diaphragm relaxes, it returns to a domelike shape.
B) When the diaphragm contracts, it pulls the floor of the thoracic cavity downward.
C) Changes in thorax size bring about inspiration and expiration.
D) Raising the ribs decreases the depth and width of the thorax.