When a priority vehicle on an emergency call approaches, other drivers must...

A)stop their vehicle.
B)always move to the right.
C)allow it to pass, stopping if necessary.Correct
As soon as they perceive the special signals announcing the approach of a priority vehicle, other drivers shall take appropriate measures, according to the circumstances of the moment and place, to allow it to pass, normally moving to the right or stopping if necessary. Priority vehicles travelling with only the light signal, i.e., without using acoustic signals, have the same consideration and right of way.