On hearing the siren. I pulled . . . . . . . . and stopped the car. A. over B. off C. up D. in

The correct answer is D. in.

When you hear a siren, you should pull over to the side of the road and stop your car. This is to allow the emergency vehicle to pass safely. You should also turn off your car and put your hazard lights on.

Option A, “over,” is incorrect because it does not indicate that you have stopped your car. Option B, “off,” is incorrect because it does not indicate that you have pulled over to the side of the road. Option C, “up,” is incorrect because it does not indicate that you have stopped your car or pulled over to the side of the road.