What is the function of the rearview mirror?

Answer: B — To monitor traffic behind you

The rearview mirror is primarily designed to monitor traffic behind you. This function is crucial for safe driving as it allows the driver to see what is occurring in the rear of the vehicle without having to turn their head. By regularly checking the rearview mirror, a driver can be aware of any vehicles approaching from behind, which is essential for actions such as merging into traffic, changing lanes, or preparing to stop. While there are other features in a vehicle that may assist with parking or provide shade, these are not the primary functions of the rearview mirror. This mirror plays a vital role in situational awareness, helping to prevent accidents and making it easier to navigate various driving conditions. Understanding this function is key for new drivers, as it directly impacts their ability to drive safely and responsibly.