Which nursing intervention is most crucial in the preoperative phase for a patient with anxiety about upcoming surgery?

Preoperative anxiety involves sympathetic activation due to perceived surgical threat, causing cortisol release, tachycardia, hypertension, and amygdala mediated fear response affecting physiological stability and psychological coping mechanisms state imbalance occurs. Rationale: A. Fluid restriction does not reduce preoperative anxiety symptoms effectively clinically. It may increase physiological stress and discomfort before surgery preoperatively. Anxiety requires psychological support and patient centered communication strategies implementation. This option fails to address underlying emotional distress properly clinically. B. Online surgical videos may worsen anxiety and fear responses significantly. Visual exposure can trigger exaggerated stress physiological arousal responses increase. Not all patients benefit from detailed procedural visualizations negatively affecting. This intervention lacks evidence for anxiety reduction benefits in surgical. C. Educational materials improve patient understanding and reduce anxiety levels significantly. Clear information decreases uncertainty and activates coping mechanisms effectively significantly. Preoperative teaching enhances patient autonomy and preparedness improves clinical outcomes. Reduces sympathetic overactivity associated with surgical stress response physiological stability. D. Discussing complications may increase fear and anxiety levels preoperatively significantly. It can activate stress response and sympathetic discharge markedly worsening. Excessive negative information undermines trust and psychological stability patient coping. Not appropriate for primary anxiety reduction intervention in preoperative phase.