A 3-year-old boy presents with painless maroon-colored rectal bleeding and abdominal pain. Vital signs show BP 95/60, HR 102/min, RR 22/min, temperature 37.2°C, and SpO2 98% on room air. Hemoglobin is 9.2 g/dL. Physical examination reveals no abdominal distension or tenderness. Technetium-99m pertechnetate scan demonstrates ectopic gastric mucosa in the distal ileum with focal uptake. Which of the following is the most likely diagnosis?

1. A)Intussusception
2. B)Juvenile polyp
3. C)Meckel diverticulumGABARITO
4. D)Hirschsprung disease
5. E)Ulcerative colitis