**Core Concept**
In the context of trauma-induced shock, the first line of therapy aims to restore circulating blood volume and maintain adequate oxygen delivery to vital organs. This is critical in preventing further tissue hypoxia and subsequent organ dysfunction. The underlying principle is to promptly address the underlying cause of shock, which in trauma cases is often due to hemorrhage or hypovolemia.

**Why the Correct Answer is Right**
The initial management of shock in trauma involves the administration of intravenous fluids to rapidly expand the circulating blood volume. This is typically achieved with crystalloids such as normal saline or lactated Ringer's solution. The goal is to restore a mean arterial pressure (MAP) of at least 65 mmHg and maintain a urine output of 0.5-1 mL/kg/hour. The use of colloids, such as albumin, may also be considered in certain situations. The administration of intravenous fluids helps to maintain perfusion of vital organs and prevent further tissue hypoxia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not address the immediate need to restore circulating blood volume and maintain adequate oxygen delivery to vital organs.
**Option B:** This option is incorrect as it may be considered in certain situations, but is not the first line of therapy in trauma-induced shock.
**Option C:** This option is incorrect as it is not a suitable initial treatment for trauma-induced shock.

**Clinical Pearl / High-Yield Fact**
In trauma-induced shock, the first 30 minutes are critical in determining patient outcomes. Prompt restoration of circulating blood volume and maintenance of adequate oxygen delivery can significantly impact patient survival and prevent further organ dysfunction.

**Correct Answer: A. Intravenous fluids.**