How do properly positioned mirrors benefit the driver?

Answer: B — They help the driver see all around the car

Properly positioned mirrors play a crucial role in enhancing a driver's awareness of their surroundings. When mirrors are adjusted correctly, they significantly expand the driver's field of view, allowing them to see vehicles and obstacles that may be present in blind spots or areas that might not be easily visible through the vehicle's rear and side windows. This increased visibility is essential for safe driving, as it enables drivers to make informed decisions when changing lanes, merging, or navigating through traffic. Thus, the primary benefit of having well-positioned mirrors is the improved ability to see all around the car, contributing to safer driving practices.