The EMT Correctly Defines a Multiple-Casualty Incident (MCI) When He

The EMT correctly defines a multiple-casualty incident (MCI) when he states:

A) "It is any event that places an excessive demand on rescue personnel and equipment."
B) "It occurs when the number of patients requiring care is greater than 10."
C) "It occurs any time the incident requires the medical director to leave the hospital and direct activities on scene."
D) "It occurs any time that five or more people are injured and require transport to different hospitals."