A 68-year-old male smoker with a 2-year history of progressive exertional dyspnoea and dry cough presents with fine bibasilar inspiratory crackles on examination. HRCT shows subpleural, basal-predominant reticulation with traction bronchiectasis and honeycombing consistent with usual interstitial pneumonia (UIP) pattern. Pulmonary function testing reveals the pattern marked **A** in the diagram. Which of the following best describes the expected physiological findings in this patient?
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