During the Initial Phase of Care for a Patient with Spinal

During the initial phase of care for a patient with spinal cord trauma at C5,why must the nurse give high priority to maintaining respiratory function?

A) At the C5 level,diaphragmatic and intercostal muscle function is lost.
B) Extension of edema above the site of the injury may affect phrenic nerve function.
C) Immobilization of the patient's spine promotes pooling of respiratory secretions.
D) Without abdominal muscle control,the patient cannot adequately cough to clear the lungs.