**Core Concept**
Ketone bodies are water-soluble molecules produced by the liver from fatty acids during periods of low food intake, carbohydrate restrictive diets, prolonged intense exercise, or in uncontrolled type 1 diabetes. In diabetic ketoacidosis (DKA), ketone body production is significantly increased due to the lack of insulin, leading to a metabolic acidosis.

**Why the Correct Answer is Right**
The correct answer is **β-hydroxybutyrate**. It is the most abundant ketone body in DKA, making up approximately 78% of the total ketone body pool. This is because the liver primarily produces β-hydroxybutyrate through the action of the enzyme acetyl-CoA acetyltransferase (also known as thiolase) on acetoacetyl-CoA, a key intermediate in the process of ketogenesis. The elevated levels of β-hydroxybutyrate contribute to the metabolic acidosis characteristic of DKA.

**Why Each Wrong Option is Incorrect**
* **Option A:** Acetone is the least abundant ketone body in DKA, making up only about 3% of the total ketone body pool. While acetone is a potent volatile ketone, its low concentration in DKA limits its contribution to the metabolic acidosis.
* **Option B:** Acetoacetate is the second most abundant ketone body in DKA, making up approximately 20% of the total ketone body pool. Although acetoacetate is a significant contributor to ketone body production, its concentration is lower than that of β-hydroxybutyrate in DKA.
* **Option D:** None of the other options provided.

**Clinical Pearl / High-Yield Fact**
When assessing a patient with suspected DKA, measuring β-hydroxybutyrate levels can provide valuable information about the patient's metabolic state. A high β-hydroxybutyrate level is indicative of significant ketone body production and metabolic acidosis.

**Correct Answer:** **C. β-hydroxybutyrate**