In Regards to Respiratory Failure,which Is True

In regards to respiratory failure,which is true?

A) Positional changes can affect the oxygenation status.
B) During the chronic phase, the kidneys have not started to compensate, and the base HCO₃⁻ is within normal limits.
C) Acute respiratory failure can be noted by an increased PCO₂, a pH within normal limits, and a low PO₂.
D) When hyperoxygenation is noted, treatment consists of oxygen therapy, CPAP or biphasic positive airway pressure, and alleviation of the cause of hyperoxygenation.