You are answering a USMLE-style medical question. Question: A 57-year-old man comes to the physician because of a 1-year history of increasing shortness of breath on exertion and a cough productive of a small amount of grayish-white phlegm. The cough had been initially nonproductive. He has not had fever or chest pain. He is originally from China and visits his family there once every year. He has worked as a car salesman for 15 years and worked in a shipyard before that for 22 years. He smoked half a pack of cigarettes daily for 13 years but stopped 25 years ago. His temperature is 37.1°C (98.8°F), pulse is 86/min, respirations are 16/min, and blood pressure is 130/80 mm Hg. Fine expiratory crackles are heard at both lung bases. An x-ray of the chest shows patchy infiltrates and supradiaphragmatic pleural thickening in both lungs. A photomicrograph from a sputum sample is shown. Further evaluation of this patient is most likely to show which of the following findings? Options: A) Increased alveolar-arterial gradient B) Bloody pleural effusion C) Concave flow-volume loop D) Increased diffusing capacity (DLCO) Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.