**Core Concept**
The question describes a combination of clinical features, including hypopigmentation, gray streaks of hair, degranulation defect of neutrophils, and neuropathy. This constellation of symptoms is associated with a specific genetic disorder that affects the production of a crucial enzyme involved in the metabolism of a key compound.

**Why the Correct Answer is Right**
The correct answer is associated with a deficiency of a specific enzyme that breaks down a fatty acid called very-long-chain fatty acids (VLCFAs). This enzyme, very-long-chain acyl-CoA dehydrogenase (VLCAD), is crucial for the normal metabolism of VLCFAs. A deficiency in VLCAD leads to the accumulation of VLCFAs, which causes a range of clinical symptoms, including hypopigmentation, gray streaks of hair, degranulation defect of neutrophils, and neuropathy. The degranulation defect of neutrophils is due to the accumulation of VLCFAs in the neutrophils, leading to impaired function.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not match the clinical features described in the question. The condition described in the question is a genetic disorder that affects the metabolism of VLCFAs, not a disorder of the immune system.

**Option B:** This option is incorrect as it does not match the clinical features described in the question. The condition described in the question is a genetic disorder that affects the metabolism of VLCFAs, not a disorder of the nervous system.

**Option C:** This option is incorrect as it does not match the clinical features described in the question. The condition described in the question is a genetic disorder that affects the metabolism of VLCFAs, not a disorder of the skin.

**Clinical Pearl / High-Yield Fact**
The condition described in the question, a deficiency of very-long-chain acyl-CoA dehydrogenase (VLCAD), is a type of fatty acid oxidation disorder (FAOD). FAODs are a group of genetic disorders that affect the metabolism of VLCFAs and can cause a range of clinical symptoms, including hypopigmentation, gray streaks of hair, degranulation defect of neutrophils, and neuropathy.

**Correct Answer:** C. Carnitine palmitoyltransferase II deficiency.

This option is correct because it is also a type of FAOD that can cause similar clinical symptoms, including hypopigmentation, gray streaks of hair, degranulation defect of neutrophils, and neuropathy.