A Patient with Acute Respiratory Distress Syndrome (ARDS)is Placed in the Prone

A patient with acute respiratory distress syndrome (ARDS) is placed in the prone position.When prone positioning is used,which information obtained by the nurse indicates that the positioning is effective?

A) The patient's PaO₂ is 89 mm Hg, and the SaO₂ is 91%.
B) Endotracheal suctioning results in clear mucous return.
C) Sputum and blood cultures show no growth after 48 hours.
D) The skin on the patient's back is intact and without redness.