A 62-year-old male presents with a complaint of shortness of breath.His spirometry results are FVC 3.3 L,FEV1 1.5 L,ratio 45.The subject performs a cardiopulmonary exercise test,and the following data are obtained: 
Which statement best describes these results?
A) Subject is ventilatory limited.
B) Subject has chronotropic insufficiency.
C) Subject has an inappropriate breathing strategy.
D) The study is submaximal.
Correct Answer:
Verified
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