**Core Concept**
Class I hypovolemic shock is a severe form of hypovolemia characterized by a significant reduction in circulating blood volume, leading to inadequate perfusion of vital organs. This condition often results from severe bleeding, burns, or other causes of significant fluid loss. The primary goal of treatment is to restore circulating blood volume and ensure adequate oxygen delivery to vital organs.

**Why the Correct Answer is Right**
Treatment of Class I hypovolemic shock involves the rapid administration of intravenous fluids, usually crystalloids or colloids, to restore circulating blood volume and maintain mean arterial pressure. This is typically done in a controlled setting, such as an operating room or intensive care unit, where close monitoring of vital signs and fluid status can be maintained. The choice of fluid and the rate of administration depend on the underlying cause of hypovolemia and the patient's response to treatment.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it implies the use of a specific medication without addressing the underlying cause of hypovolemia. While medications may be used to support blood pressure or cardiac function, they do not replace the need for fluid resuscitation in Class I hypovolemic shock.

**Option B:** This option is incorrect because it suggests a delay in treatment, which can exacerbate the condition and lead to further organ damage.

**Option C:** This option is incorrect because it implies the use of a specific type of fluid without considering the underlying cause of hypovolemia or the patient's fluid status.

**Clinical Pearl / High-Yield Fact**
In Class I hypovolemic shock, the initial goal is to restore circulating blood volume, which can be achieved by administering 2-4 L of crystalloid fluids in the first 30 minutes. This is often referred to as the "fluid bolus" phase.

**Correct Answer: A. Intravenous fluids.