An 18-year-old man has pain in the right hip and flank after an auto accident. He is stable. Examination shows ecchymosis over the iliac crest and right flank abrasions. Urinalysis shows gross blood. CT cervical spine is normal. Next step?
A) Administer analgesics and observe
B) Perform a pelvic X-ray
C) Order a CT scan of the abdomen and pelvis
D) Perform a retrograde urethrogram