A 68-year-old man with severe COPD (FEV₁ 25% predicted) presents with acute dyspnea and palpitations. His ECG shows a narrow-complex tachycardia with heart rate 125 bpm, ≥3 distinct P-wave morphologies, and varying PR intervals. The rhythm is irregular. Which of the following best explains why this arrhythmia, marked as D in the diagram, is most commonly associated with severe COPD?

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