When an emergency vehicle is approaching, moving to the extreme right is the appropriate action to take. This action allows the emergency vehicle clear access to proceed through the roadway. By moving to the right, you create a buffer zone for the emergency responders, which ensures that they can navigate safely and quickly to the scene of an emergency.
Stopping immediately in your lane can create confusion and potentially lead to accidents, as vehicles behind you may not be expecting such a sudden stop. Speeding up to attempt to get out of the way could also lead to dangerous situations, including collisions. Moving to the left in this context does not effectively make room for the emergency vehicle and could put you and others at risk.
Thus, the correct response to an approaching emergency vehicle is to safely and calmly move to the extreme right.