A 52-year-old male smoker with 30 pack-years presents to the respiratory clinic with dyspnea on exertion. Spirometry shows FEV1 of 68% predicted with an FEV1/FVC ratio of 0.62, consistent with mild-to-moderate airflow obstruction. He is counseled on smoking cessation and successfully quits with behavioral support. Serial spirometry is planned to monitor his lung function trajectory. The structure marked **A** in the diagram represents the expected pattern of FEV1 decline after successful cessation. Based on the Lung Health Study, which of the following best describes the physiological change in FEV1 decline rate that occurs in sustained quitters?
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