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Comprehensive and Detailed Explanation:

The correct answer is A because hyperthermia in the acute phase of stroke is a major secondary brain injury mechanism that dramatically increases metabolic demand, worsens ischemic injury within the penumbra, and leads to poorer functional outcomes. Prompt identification of fever, administration of antipyretic agents such as acetaminophen, and rigorous investigation into common sources of healthcare-associated infections (such as urinary tract infections from indwelling catheters, aspiration pneumonia, or central line infections) are critical nursing responsibilities. Option B is incorrect because minor lethargy and fever do not automatically necessitate immediate neuroimaging unless an acute intracranial event is strongly suspected, and stopping nutrition prematurely can compromise metabolicstatus. Option C is incorrect because raising the bed to 90 degrees is unnecessary unless aspiration precautions or respiratory distress specifically dictate positioning, and intubation is not indicated based on these stable parameters. Option D is incorrect because aggressive induced hypothermia (<35°C) is not a standard acute stroke nursing intervention for simple fever management and carries risks of shivering, coagulopathy, and cardiac arrhythmias. Managing normothermia is a core competency for stroke-certified nurses striving to prevent secondary neuronal destruction.