What type of light should be used to mark extremely hazardous conditions?

The correct choice emphasizes the use of Type B lights to mark extremely hazardous conditions. Type B lights are specifically designed for high visibility and are particularly effective in alerting individuals to dangerous situations. These lights typically provide a more intense illumination compared to other types and often feature a flashing or rotating mechanism that enhances their visibility, especially in low-light or hazardous environments.

By using Type B lights, workers and the public can better recognize and respond to the dangers present, ensuring an increased level of safety. In any situation where visibility and awareness of hazards are critical, Type B lights serve as a reliable option to convey urgency and alertness, making them the preferred choice for marking areas of extreme risk.