Activation of the EMS system begins with

The EMS system is activated when an emergency is recognized by a bystander, patient, or first responder. NREMT describes EMS activation as a sequence that begins with recognizing an emergency and then accessing the system.

Option D (Recognition) is correct because without recognition, no call for help occurs.

Option C (Notification) follows recognition.

Option B (Dispatch) occurs after notification.

Option A (Response) is the physical movement of EMS resources after dispatch.

NREMT emphasizes public education on recognizing emergencies as a key component of effective EMS systems.