In Patients with Moderate COPD,the Pulmonary Function Tests Usually Result

In patients with moderate COPD,the pulmonary function tests usually result in a predicted FEV₁/FVC ratio of ____ and FEV₁ of ____:

A) <40%, ≥60%
B) <50%, ≥80%
C) <70%, 50% to 80%
D) <70% and 30% to 40%