A previously healthy infant presents with recurrent episode of abdominal pain.The mother says that the child has been passing altered stool after episodes of pain,but gives no history of vomiting or bleeding per rectum.Which of the following is the most likely diagnosis:

• A. Intussuception
• B. Rectal Polyps
• C. Necrotizing Enterocolitis
• D. Meckel's Diverticulum