When assessing an older adult client, the nurse finds that the client is experiencing orthopnea and has an oxygen saturation reading of 93% on room air. Auscultation of the lungs reveals crackles and bilateral pedal edema are present. In which order should the nurse implement these actions? (Arrange in the order from first on top to last on the bottom.)

Rationale: A. Raise the head of the bed to Fowler's position: This immediately relieves orthopnea by improving lung expansion and reducing the work of breathing. Positioning is a first-line, non-invasive intervention to enhance respiratory comfort. B. Provide oxygen per nasal cannula: Oxygen improves tissue oxygenation and prevents hypoxia progression. Although the saturation is borderline normal, oxygen can reduce respiratory effort in the context of fluid overload. C. Administer a prescribed dose of furosemide: Diuretics treat the underlying cause—fluid overload related to possible heart failure. Removing excess fluid will decrease pulmonary congestion and peripheral edema. D. Monitor urinary output: This evaluates the effectiveness of the diuretic therapy. Adequate urine output indicates that fluid is being removed and helps prevent worsening heart failure or electrolyte imbalance.