Which statement correctly describes what happens during expiration?
A. The external intercostal, pectoralis minor, and sternocleidomastoid muscles contract to expand the rib cage and the diaphragm contracts to flatten its dome shape.
B. The external intercostal and sternocleidomastoid muscles relax to expand the rib cage and the diaphragm relaxes to return to its dome shape.
C. The external intercostal, pectoralis minor, and sternocleidomastoid muscles relax allowing the rib cage to return to its unexpanded size and the diaphragm relaxes to return to its dome shape.
D. The external intercostal, pectoralis minor, and sternocleidomastoid muscles contract to expand the rib cage and the diaphragm relaxes to return to its dome shape.
Answer: C
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