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A 28-year-old female sustained blunt abdominal trauma in a MVC. She is alert, BP 102/78, HR 118, skin pale and cool, capillary refill 3 seconds. Estimated blood loss is 900 mL. Which compensatory mechanism is MOST responsible for maintaining her blood pressure at this time?

Increased vagal tone allowing longer diastolic filling time to increase stroke volume Renal renin release activating angiotensin II causing vasoconstriction and aldosterone-mediated sodium retention Hypothalamic ADH secretion causing free water reabsorption in the collecting ducts to expand volume Sympathetic nervous system activation causing tachycardia and peripheral vasoconstriction via catecholamine release