After receiving report on an inpatient acute care unit, which client should the nurse assess first?

A. Abdominal rigidity in a client with a bowel obstruction due to a volvulus indicates possible peritonitis, which is a medical emergency. B. Paralytic ileus with absent bowel sounds is concerning but not immediately life- threatening. C. A nasogastric tube draining greenish fluid is expected in small bowel obstruction. D. Abdominal distention in large intestine obstruction is concerning but less urgent than potential peritonitis.