A patient is weaning from mechanical ventilation on the following ventilator settings: 1)Mode SIMV, Mandatory rate 6/min, Total rate 30/min, VT (set) 500 mL, VT (exhaled) 220 mL, FIO2 0.40, PEEP 5 cmH2O, Pressure support 6 cmH2O, Arterial blood gas results show: pH 7.34, PaCO2 46 torr, PaO2 80 torr, HCO3- 24 mEq/L, BE -2 mEq/L. The respiratory therapist should recommend
A. Increasing pressure support
B. Switching to assist/control mode of ventilation
C. Increasing the set tidal volume
D. Increasing PEEP to 10 cm H2O
