How should the driver's mirrors be maintained for a pre-trip inspection?

Answer: C — Should be clean and free of obstruction

For a pre-trip inspection, it's essential that the driver's mirrors are clean and free of obstruction. Clean mirrors provide a clear view of the road and surrounding environment, which is crucial for safe driving. Any dirt, grime, or obstructions can hinder the driver’s visibility, increasing the risk of accidents. Ensuring that mirrors are properly maintained helps in presenting a complete assessment of the vehicle's surroundings, allowing the driver to make informed decisions. This aspect of safety is crucial, as it directly impacts the driver's ability to monitor other vehicles, pedestrians, and hazards while on the road.