What is the correct adjustment for the rear view mirror?

The correct adjustment for the rear view mirror is to show as much of the back window as possible. This allows the driver to have a clear view of what is behind the vehicle, which is crucial for safe driving. When the mirror is positioned to maximize visibility of the back window, it helps the driver monitor traffic, pedestrians, and other hazards that may not be visible through the side mirrors alone. This panoramic view is essential for making informed decisions, especially when changing lanes, merging, or reversing.

While the other options may suggest certain adjustments, they do not provide the comprehensive visibility necessary for safe driving practices. For instance, showing less of the back window or adjusting the mirror just to see side vehicles limits the driver's field of view and can create blind spots, which might increase the risk of accidents. Setting the mirror low could also lead to distractions as it may require the driver to refocus frequently or may not reflect important surroundings adequately. Therefore, ensuring the mirror allows for maximum view of the back window is the optimal choice for safety and effective vehicle operation.