Exhibits Which physical sign most strongly supports the nurse's concern for worsening asthma?

A. Normal temperature: A temperature of 98.6°F (37°C) is within the normal range and does not contribute to the assessment of asthma severity. It helps rule out infection but does not reflect worsening respiratory status. B. Slightly elevated heart rate: A heart rate of 122 bpm is elevated for a 7-year-old and may indicate respiratory distress or anxiety. However, it is a nonspecific finding and not the strongest indicator of worsening asthma. C. Nasal flaring and intercostal retractions: These are classic signs of increased work of breathing and indicate significant respiratory distress. They reflect worsening airway obstruction and the need for immediate intervention to prevent further deterioration. D. Use of maintenance inhaler: Use of a maintenance inhaler such as fluticasone is part of routine asthma management and does not indicate worsening symptoms. It is a preventive measure, not a reflection of acute status.