A client with a T6 spinal cord injury suddenly develops severe hypertension, headache, flushed skin above the level of injury, and cool, pale lower extremities. Which pathophysiologic mechanism best explains these findings?

Uncontrolled sympathetic response below the level of injury.

Decreased norepinephrine release causing systemic hypotension.

Increased intracranial pressure causing reflex bradycardia.

Loss of parasympathetic control leading to widespread vasodilation.