What is the minimum height above water for all-round white lights on an inconspicuous partly submerged object?

The correct answer is based on the COLREGs requirements for lighting on inconspicuous partly submerged objects. According to these regulations, all-round white lights on such objects must be positioned at a minimum height of 2 meters above the water.

This height is specified to ensure adequate visibility for other vessels navigating in the area. The height of the light plays a crucial role in allowing other ships to see the object from a sufficient distance, helping to prevent collisions. An all-round white light indicates the presence of the object and is essential for safety on the water, particularly since the object can be difficult to perceive in certain conditions.

The choices that suggest heights either lower or higher than 2 meters do not align with the COLREGs stipulations. Therefore, 2 meters is established as the standard to maximize safety while taking into account the visibility needs of approaching vessels.