**Core Concept:**
The question is asking about a clinical scenario involving a child presenting with symptoms of recurrent obstruction, abdominal mass, and diarrhoea. These symptoms can be indicative of certain gastrointestinal conditions.

**Why the Correct Answer is Right:**
The correct answer, **Option D: Meckel's Diverticulum**, is a vestigial remnant of the embryonic midgut, which is a small pouch located in the wall of the small intestine. When it becomes inflamed or infected, it can lead to a clinical presentation similar to that described in the question. This condition is known as Meckel's Diverticulitis or Diverticulosis.

**Why Each Wrong Option is Incorrect:**

A. **Option A: Hirschsprung's Disease:** This condition is characterized by the absence of ganglion cells in the distal colon and rectum, causing constipation and megacolon. The given scenario does not match the clinical presentation of Hirschsprung's Disease.

B. **Option B: Volvulus:** Volvulus refers to the twisting of an organ around its vascular axis, commonly seen in the small bowel or colon. However, the symptoms described (recurrent obstruction) are not specific to volvulus alone.

C. **Option C: Inflammatory Bowel Disease (IBD):** IBD includes Crohn's disease and ulcerative colitis. Although IBD can cause diarrhoea, the symptoms of recurrent obstruction and abdominal mass are not typical of IBD.

**Clinical Pearl:**
A detailed clinical history, physical examination, and appropriate imaging studies can help in diagnosing the correct condition. A thorough understanding of the differential diagnoses is essential to accurately diagnose and manage the patient.

**Correct Answer:** Option D: Meckel's Diverticulum. Meckel's Diverticulum, when inflamed or infected, can present with recurrent obstruction, abdominal mass, and diarrhoea, making it the correct answer.