Rationale: A. This option is incorrect because discontinuing oxygen while the client is still experiencing dyspnea could worsen hypoxia or respiratory distress, even though the oxygen saturation is within normal limits. Assessment of symptoms is crucial. B. This option is correct because the client’s oxygen saturation is already 98%, which is within the normal range (typically 95–100%), so increasing or decreasing oxygen is unnecessary. The PN should continue monitoring the client and investigate other causes of dyspnea, such as anxiety, pain, or underlying respiratory or cardiac conditions. Oxygen should be titrated based on both saturation and clinical symptoms, not just numbers. C. This option is incorrect because increasing oxygen when saturation is already adequate may provide no benefit and could lead to oxygen toxicity in certain populations, such as clients with chronic lung disease. D. This option is incorrect because decreasing oxygen could reduce oxygen saturation below safe levels and worsen the client’s shortness of breath. The client should continue at the prescribed rate until reassessment indicates a safe adjustment.