**Core Concept**
The child's presentation of hepatomegaly, hypoglycemia, and growth failure suggests a disorder of glycogen storage and metabolism, specifically affecting the liver.

**Why the Correct Answer is Right**
The symptoms are consistent with McArdle's disease (Glycogen Storage Disease Type III), caused by a deficiency of the debranching enzyme (amylo-1,6-glucosidase). This enzyme is crucial for the breakdown of glycogen, leading to its accumulation in the liver and muscles. The liver's inability to release glucose from glycogen results in hypoglycemia. Hepatomegaly occurs due to the accumulation of glycogen in hepatocytes, while growth failure is a consequence of the metabolic derangement.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be a distractor for diseases like Wilson's disease or alpha-1 antitrypsin deficiency, which also cause hepatomegaly. However, they don't primarily present with hypoglycemia and growth failure.
**Option B:** Glycogen Storage Disease Type I (Von Gierke's disease) is characterized by severe hypoglycemia and lactic acidosis, but hepatomegaly is not as pronounced as in McArdle's disease.
**Option C:** This option may be a distractor for diseases like Hurler syndrome, which presents with growth failure and hepatomegaly. However, hypoglycemia is not a primary feature.
**Option D:** This option may be a distractor for diseases like Pompe disease, which presents with glycogen accumulation in muscles. However, hepatomegaly and hypoglycemia are not primary features.

**Clinical Pearl / High-Yield Fact**
McArdle's disease is an autosomal recessive disorder, and patients typically present with symptoms in early childhood. Early diagnosis and management are crucial to prevent long-term complications.

**Correct Answer: C**