A 10-month-old boy presents with episodic severe colicky abdominal pain and leg flexion, followed by bilious vomiting and lethargy. Vitals show HR 128/min, RR 26/min, BP 95/60 mmHg, and temp 38.2°C. He has passed bloody stools with a currant jelly appearance. Abdominal ultrasound demonstrates a target sign in the right abdomen. CBC shows mild leukocytosis (WBC 13,200/μL). There is no fever preceding symptom onset. Which of the following is the most likely diagnosis?

1. A)Hypertrophic pyloric stenosis
2. B)IntussusceptionGABARITO
3. C)Meckel diverticulum
4. D)Necrotizing enterocolitis
5. E)Hirschsprung disease