**Core Concept**
Neuroblastoma is a type of pediatric cancer that originates from the neural crest cells of the sympathetic nervous system. The most common presentation of neuroblastoma is related to the symptoms caused by the tumor's location and its effects on surrounding structures.

**Why the Correct Answer is Right**
The most common presentation of neuroblastoma is abdominal pain, often accompanied by a palpable abdominal mass. This is due to the tumor's tendency to arise in the adrenal glands or along the sympathetic chain in the abdomen. As the tumor grows, it can compress or invade surrounding organs, leading to pain and other symptoms. In infants and young children, the tumor may also cause a range of non-specific symptoms, including irritability, fever, and weight loss.

**Why Each Wrong Option is Incorrect**
**Option A:** Neurological deficits such as weakness or paralysis are not the most common presentation of neuroblastoma, although they can occur in advanced cases.
**Option B:** Although some neuroblastomas may present with skin changes or a bluish discoloration of the skin due to catecholamine production, this is not the most common presentation.
**Option C:** Fever and weight loss are non-specific symptoms that can be associated with many conditions, including neuroblastoma, but are not the most characteristic presentation.

**Clinical Pearl / High-Yield Fact**
Neuroblastoma is the most common extracranial solid tumor in children, accounting for approximately 7% of all childhood cancers.

**Correct Answer:** D. Abdominal pain and palpable abdominal mass