Final answer:
When you encounter an emergency vehicle with a siren and red light, the proper action is to drive to the right side of the road and stop to allow it to pass safely.
Step-by-step explanation:
When you see an emergency vehicle with a siren and red light, you should drive as close to the right edge of the road as possible and stop. This ensures the emergency vehicles have the clearest path to navigate and respond rapidly to the situation at hand. The correct answer to your question is: 3) Drive as close to the right edge of the road as possible and stop. Remember not to block intersections and to only proceed through an intersection if you are already there when you notice the emergency vehicle, then pull over as soon as it's safe after crossing.