An Experienced CRNA Administered MAC to a 29-Year-Old Female Undergoing

An experienced CRNA administered MAC to a 29-year-old female undergoing local scar revision surgery for an old abdominal incision.She titrated midazolam and propofol to dull the patient's level of consciousness.She was alerted by the dropping SpO₂ reading and the patient's loss of chest movement.The patient did not respond to a head-tilt/chin-lift maneuver.The CRNA's next response to this event is to:

A) alert the surgeon and ventilate the patient's lungs with a self-inflating bag-valve-mask.
B) increase the O₂ to 10 L/min, gently tap the patient's shoulder, and call the patient's name.
C) begin chest compressions.
D) call for the code cart and difficult airway cart.