**Core Concept**
Diabetic ketoacidosis (DKA) is a metabolic complication of diabetes mellitus characterized by hyperglycemia, metabolic acidosis, and ketosis. The initial management of DKA involves correcting the fluid deficit, electrolyte imbalance, and hyperglycemia.

**Why the Correct Answer is Right**
The initial line of management in DKA involves administering intravenous fluids to correct the fluid deficit and electrolyte imbalance. This is typically achieved with a combination of normal saline and potassium chloride. The goal is to replace the lost fluids and electrolytes, which helps to improve the circulation and increase the glomerular filtration rate, thereby facilitating the excretion of glucose and ketones. The use of normal saline also helps to correct the metabolic acidosis by improving the circulation and increasing the production of bicarbonate.

**Why Each Wrong Option is Incorrect**
**Option A:** Insulin is typically administered after the fluid and electrolyte deficits have been corrected, as administering insulin too early can lead to hypoglycemia.
**Option B:** Corticosteroids may be used in cases of adrenal insufficiency or other underlying conditions that may be contributing to the development of DKA, but they are not the initial line of management.
**Option C:** Glucose is not administered initially in DKA, as the body is unable to utilize glucose due to the presence of insulin resistance and ketosis.

**Clinical Pearl / High-Yield Fact**
In DKA, the initial management should focus on correcting the fluid and electrolyte deficits before administering insulin, as administering insulin too early can lead to hypoglycemia.

**Correct Answer:** C.