Why are the rings of cartilage surrounding the trachea C-shaped?
A) The C rings of cartilage allow the trachea to change diameter during breathing.
B) The C rings of cartilage allow the esophagus to expand during swallowing.
C) The C rings of cartilage allow the esophagus to expand during swallowing,allow the trachea to change diameter during breathing,and keep the trachea patent (open) .
D) The C rings of cartilage keep the trachea patent (open) .
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