A client with acute abdominal pain, persistent nausea, and projectile vomiting is admitted to the hospital for observation. Acetaminophen is administered as prescribed for an oral temperature of 103°F (39.4°C) and an IV infusion of normal saline is initiated at 250 ml/hour. Which assessment finding should the nurse report to the healthcare provider immediately?

Choice A reason: Petechial haemorrhage under the client's eyes can be a sign of various conditions, including increased intrathoracic pressure from vomiting. However, it is not the most urgent finding in this scenario. The nurse should focus on the finding that indicates a potential life-threatening condition.Choice B reason: Right lower abdomen rebound tenderness is a sign of peritonitis, which can be caused by appendicitis or other serious abdominal conditions. This is an urgent finding that requires immediate medical attention, as it indicates inflammation of the peritoneum and potential risk of perforation or severe infection.Choice C reason: Severe headache with photosensitivity can be associated with conditions such as meningitis or migraines. While concerning, it does not take precedence over the abdominal signs that indicate a potentially life-threatening condition like peritonitis.Choice D reason: Dark green coloured emesis can be indicative of bile or upper gastrointestinal content, which might be seen in conditions such as intestinal obstruction or vomiting. However, it is not as urgent as the finding of rebound tenderness, which suggests an acute and severe abdominal condition that needs immediate intervention.