Which of the Following Criteria Would Be Considered an Indication

Which of the following criteria would be considered an indication for supplemental oxygen in a patient with right-sided heart failure?

A) Arterial partial pressure of ≤ 55 mm Hg or oxygen saturation ≤ 88%
B) Arterial partial pressure of ≤ 59 mm Hg or oxygen saturation ≤ 89%
C) Arterial partial pressure of ≤ 50 mm Hg or oxygen saturation ≤ 85%
D) Arterial partial pressure of 40 ≤ mm Hg or oxygen saturation ≤ 83%