What does a solid yellow line signify regarding passing?

Answer: C — No passing is allowed

A solid yellow line indicates that no passing is allowed. This marking is intended to keep drivers informed about the safety of passing in that particular area. When a solid yellow line is present, it generally means that the roadway does not provide enough visibility or space to safely execute a passing maneuver. This helps prevent accidents by discouraging drivers from attempting to overtake another vehicle in scenarios where it could be dangerous. The other options present situations that are not applicable when a solid yellow line is present. There is no encouragement or allowance for passing on either side when this marking is in place, as it serves specifically to indicate that drivers should remain in their lane for safety. Therefore, understanding the significance of road markings like the solid yellow line is crucial for maintaining safe driving practices.