**Core Concept**
Insulin administration can be through various routes, each with its own advantages and indications. The primary goal is to achieve optimal glucose control while minimizing side effects. The most common sites for insulin administration are those with rich blood supply and minimal risk of lipodystrophy.

**Why the Correct Answer is Right**
Insulin can be administered intravenously, subcutaneously, intramuscularly, or via an insulin pump. The correct sites for insulin administration include subcutaneous injection areas like the abdomen, thighs, and arms. These areas have a rich network of blood vessels, allowing for efficient absorption of insulin.

**Why Each Wrong Option is Incorrect**
**Option A:** Intravenous insulin administration is indeed a valid method, commonly used in critical care settings to rapidly correct hyperglycemia.
**Option B:** Intramuscular insulin administration is not a recommended practice due to the risk of lipodystrophy, inflammation, and insulin resistance.
**Option C:** Subcutaneous insulin injection is a standard method, but the correct answer is not asking about this. However, subcutaneous insulin administration at the correct sites is crucial for minimizing side effects.

**Clinical Pearl / High-Yield Fact**
When administering insulin subcutaneously, it's essential to rotate injection sites to prevent lipodystrophy and maintain optimal glucose control.

**Correct Answer: B. Intramuscular insulin administration is not a recommended practice due to the risk of lipodystrophy, inflammation, and insulin resistance.**