A 49-year-old patient is in cardiac arrest.

The correct answer is C because a patient in cardiac arrest is unable to speak or make decisions, so EMS care is allowed under the legal principle of implied consent . On many exams, this may appear under the broader consent concept when emergency treatment is immediately necessary to preserve life.

In EMT practice, when a patient is unconscious and has no pulse, the law assumes that a reasonable person would want lifesaving treatment, including CPR and AED use . That is what allows the EMT to apply the AED without waiting for permission.