A 28-year-old woman with episodic wheeze and nocturnal cough undergoes spirometry. The pre-bronchodilator FEV1/FVC is 0.62 (reduced). After inhalation of 400 μg salbutamol, the FEV1 improves from 2.1 L to 2.5 L. The spirometry curve now shows the pattern marked B in the diagram. Which of the following best explains the diagnostic significance of this finding?

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