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Forced expiratory volume (FEV) is the greatest volume of air a person can breathe out in 1 second. Forced vital capacity (FVC) is the greatest volume of air a person can breathe out in a single breath. Figure 2 shows results for the volume of air breathed out by three groups of people, A, B and C. Group A had healthy lungs. Groups B and C had different lung conditions that affect breathing. Asthma affects bronchioles and reduces flow of air in and out of the lungs. Fibrosis does not affect bronchioles; it reduces the volume of the lungs. Which group, B or C, was the one containing people with fibrosis of their lungs? Use the information provided and evidence from Figure 2 to explain your answer.

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