What should you do when you see an emergency vehicle?

Answer: B — Move to the shoulder

When an emergency vehicle is approaching, it is important to move safely out of their way to let them pass through. Taking the nearest exit, reducing your speed, or merging into the left lane may not give enough space for the emergency vehicle to safely pass. Moving to the shoulder is the best option as it allows ample space for the emergency vehicle to pass without disrupting the flow of traffic. Remember, it's always important to yield to emergency vehicles to ensure the safety of everyone on the road.