An 87-year-old male complains of difficulty breathing. He tells you he fell four feet from his porch and struck his chest on a brick wall. You observe a segment of his right chest wall moves inward when he inhales. You auscultate clear lung sounds in all fields. You should:
a) Apply oxygen via nasal cannula
b) Perform a focused assessment for trauma (FAST) exam
c) Suspect a possible flail chest and provide supportive care
d) Administer analgesics for pain relief