Which of the following patients is at the highest risk for developing pneumonia?

Rationale: A. Seasonal allergies do not significantly increase the risk of pneumonia; they affect the upper airways but not typically the lower respiratory tract. B. A recent ankle sprain has no direct connection to pneumonia risk. C. Regular exercise generally improves respiratory and immune health, lowering pneumonia risk. D. Older adults with COPD are at the highest risk. Age-related immune decline and chronic lung disease impair airway clearance and defense mechanisms, making pneumonia more likely and more severe.