A Male Patient (83-Kg IBW)is Intubated and Ventilated with PC-CMV,f

A male patient (83-kg IBW) is intubated and ventilated with PC-CMV,f = 12/min,set PIP = 28 cm H₂O,resulting in a Vᴛ of 430 mL.The ABG results on this setting are: pH 7.35,PₐCO₂ 45 mm Hg,and HCO₃⁻ 23 mEq/L.Forty-eight hours later on the same settings,the ABG results are: pH 7.54,PₐCO₂ 27 mm Hg,and HCO₃⁻ 21 mEq/L with an exhaled Vᴛ of 800 mL.The most appropriate action at this time is which of the following?

A) Decrease PIP to 25 cm H₂O.
B) Decrease PIP to 19 cm H₂O.
C) Decrease f to 10/min.
D) Decrease f to 8/min.