**Core Concept**
The patient's symptoms of recurrent hypoglycemia, drowsiness, sweating, and palpitations, along with low blood glucose and C-peptide levels, suggest a disorder of glucose regulation. This condition is characterized by inadequate insulin production and/or insulin resistance, leading to impaired glucose homeostasis.

**Why the Correct Answer is Right**
The patient's presentation is consistent with a diagnosis of pancreatic diabetes or diabetes mellitus type 1. The low C-peptide levels indicate that the patient is not producing sufficient insulin, as C-peptide is a byproduct of insulin production. The symptoms of hypoglycemia and the response to intravenous glucose further support this diagnosis. In type 1 diabetes, the pancreas is unable to produce sufficient insulin due to autoimmune destruction of the beta cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided in the question.

**Option B:** This option is not provided in the question.

**Option C:** This option is not provided in the question.

**Option D:** This option is not provided in the question.

**Clinical Pearl / High-Yield Fact**
A key feature of type 1 diabetes is the presence of autoantibodies against pancreatic islet cells, which can be detected in some patients. However, this is not a diagnostic criterion and is not mentioned in the scenario.

**Correct Answer: D.**