Why did the standardization of national EMS come under the direction of the Department of Transportation and not the Department of Health?

a. There were so many traffic accidents at that time,
b. The first role of EMS in the United States is a transportation service, not a medical one.
c. Heart defibrillators and other new medical technologies had yet to be invented for use on the road,
d. The Department of Health was not organized to set up standards for medical care in trauma situations,