A 62-year-old man with a 40 pack-year smoking history presents with progressive dyspnea and chronic cough. Spirometry shows FEV1/FVC ratio of 0.58 (obstructive pattern) with FEV1 65% predicted. DLCO is reduced at 55% predicted. On review of the pulmonary function test report, the parameter marked **D** (KCO) is also reduced at 68% predicted. Which of the following diagnoses is most consistent with this pattern of obstructive airway disease with reduced DLCO and reduced KCO?