Answer :

The role that is assumed to be played by the most senior EMT​, in the situation where an EMS unit is the first to respond to a​ multiple-casualty incident is the Incident commander. Hence, Option B is correct.

What is an incident?

When an event that took place or happens and sometimes there are some casualties that happen, and sometimes all are safe. This situation is known as an incident.

As per the given situation, when multiple casualties took place, this will be marked as an incident and the unit that will respond first will be called as Incident commander.

Thus, Option B is correct.

Learn more about the incident from here:

https://brainly.com/question/15016943

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The complete question is attached in text form:

If an EMS unit is the first to respond to a​ multiple-casualty incident, which role does the most senior EMT​ assume?

A.

Section coordinator

B.

Incident commander

C.

Scene leader

D.

Ground chief