**Core Concept**
The underlying principle being tested is the physiological adaptation of glucose metabolism in neonates after birth. **Glucose homeostasis** is crucial in the first few hours of life, and understanding the normal fluctuations in blood glucose levels is essential for pediatric care.

**Why the Correct Answer is Right**
Normally, after birth, neonates experience a drop in blood glucose levels due to the cessation of maternal glucose supply and the initial inefficiency of their own glucose regulatory mechanisms. This physiological hypoglycemia typically reaches its nadir around 2-3 hours of age. The correct answer choice should reflect this timeframe, considering the normal physiological adaptation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option would be incorrect if it suggests a time too early or too late for the physiological nadir of blood glucose levels in neonates.
**Option B:** Similarly, this would be incorrect if it does not align with the expected timeframe for the lowest blood glucose level in neonates after birth.
**Option C:** This option is incorrect if it suggests a timeframe that does not match the physiological adaptation of glucose metabolism in neonates.
**Option D:** This would be incorrect for the same reasons as the other options, not reflecting the correct timing of the lowest blood glucose level in neonates.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that neonates have a limited capacity for gluconeogenesis and glycogenolysis, making them more susceptible to hypoglycemia. Monitoring and managing blood glucose levels is critical in the first few hours of life.

**Correct Answer:** C. 2 to 3 hours