What is the question? It doesn't show...
I really think its d and good question
Cardiopulmonary resuscitation (CPR) is a lifesaving technique useful in many emergencies, including heart attack or near drowning, in which someone's breathing or heartbeat has stopped. The American Heart Association recommends that everyone — untrained bystanders and medical personnel alike — begin CPR with chest compressions.
Answer:
The answer is C
Explanation:
The tracker is the most reliable