Flat mirrors are to be adjusted to show the driver what distance to the rear of the vehicle?

Answer: C — The rear tire touching the ground

The correct answer is that flat mirrors should be adjusted to show the driver a distance of 200 feet to the rear of the vehicle. This adjustment is critical for ensuring the driver has a clear view of the area behind the bus, allowing for safe maneuvering and travel. The 200-foot guideline helps drivers be aware of any potential hazards or obstacles that may be in their path, providing an adequate field of vision that extends far enough to make informed driving decisions. Properly adjusting mirrors to this distance enhances the driver's awareness and increases safety while driving a larger vehicle like a school bus, which has significant blind spots. This distance is more effective than shorter distances, such as showing only the area immediately behind the bus, which could be limiting in terms of overall visibility.