Use Case D to Answer the Following Questions

Use Case D to answer The Following questions
CASE D
The dental hygienist observes an older adult client as he walks toward her. She notes that he uses a cane, walks slowly, and appears to be short of breath. As she reviews the health history with him, the client tells her that he takes a diuretic and a "drug for his heart," which she recognizes as an angiotensin-converting enzyme (ACE) inhibitor. His respirations are 26 per minute and shallow. Pulse rate is 90 beats per minute and regular. After consultation with the client's physician, who confirms that the client is being treated for congestive heart failure (CHF) but is healthy enough for routine dental treatment, the dental hygienist begins an initial assessment.
-A dental client becomes unconscious but is breathing and has a pulse. The EMS has been activated. While monitoring respirations, the dental hygienist notices that the rate has dropped to three respirations per minute. The BEST treatment while waiting for the EMS to arrive would be to:

A) Allow the client to continue breathing at three respirations per minute
B) Apply a face mask with low-flow oxygen
C) Use an Ambu bag to administer supplemental high-flow oxygen and ventilate at about 10 to 12 times per minute
D) Use an Ambu bag to administer supplemental high-flow oxygen and ventilate at least 20 times per minute