Final answer:
The EMTs must have at least eight hours of training or experience to demonstrate competency.
Step-by-step explanation:
The emergency responder that must have at least eight hours of training or experience to demonstrate competency is the Emergency Medical Technician (EMT). EMTs provide basic care and have knowledge of common medical conditions. They can administer certain medications and treatments, such as oxygen for respiratory problems and epinephrine for allergic reactions.