When determining productivity of an EMS system, the EMS provider:

A) calculates the ratio of EMS calls to the number of operating ambulances.
B) determines the number of paramedics on duty versus the number of EMS calls.
C) calculates the number of critical patients per month and how many survived.
D) measures how many patient transports per hour each ambulance accomplishes.

Answer: D) measures how many patient transports per hour each ambulance accomplishes.