All of the Following Would Prevent a Physician from Performing

All of the following would prevent a physician from performing bronchoscopy for a patient except for a/an ______________________.

A) PaO₂ of 45 mm Hg
B) international normalized ratio (INR) of 4.5
C) PaCO₂ of 38 mm Hg
D) current heart rate of 120 beats/min and rhythm of atrial fibrillation.