The stopping sight distance depends upon A. total reaction time of driver B. speed of vehicle C. efficiency of brakes D. all of the above

The correct answer is D. all of the above.

The stopping sight distance is the distance a vehicle needs to stop safely. It depends on the following factors:

• Total reaction time of driver: This is the time it takes for the driver to see a hazard, recognize it as a hazard, and take action to stop the vehicle.
• Speed of vehicle: The faster the vehicle is going, the longer it will take to stop.
• Efficiency of brakes: The better the brakes, the shorter the stopping distance will be.
• Road conditions: The road surface, weather conditions, and other factors can affect the stopping distance.

It is important to be aware of the stopping sight distance when driving. If you are driving too fast, you may not be able to stop in time to avoid an accident. It is also important to be aware of the road conditions and to adjust your driving accordingly.