When we notice the presence of an ambulance circulating on an emergency call, how must we act?

A)We will stop immediately.
B)We will always pull over to the right.
C)We will give way by adopting the appropriate measures depending on the circumstances.Correct
When we notice the presence of an ambulance on an emergency call, we are obliged to give way to it. Sometimes we will do so by stopping, other times by pulling over to the right or left, depending on the circumstances of the moment.
Priority vehicles travelling on emergency service shall warn of their presence by simultaneous use of the light signal and the device emitting special acoustic signals. However, their drivers may use the light signal alone when omitting the special acoustic signals does not entail any danger to other users. In this latter case they will continue to be considered as priority vehicles by the rest of the users, who must give way to them.
Priority vehicles travelling on emergency service shall warn of their presence by simultaneous use of the light signal and the device emitting special acoustic signals. However, their drivers may use the light signal alone when omitting the special acoustic signals does not entail any danger to other users. In this latter case they will continue to be considered as priority vehicles by the rest of the users, who must give way to them.