Which buoy will NOT display white retroreflective material?

The correct choice indicates that the preferred channel mark will not display white retroreflective material. This is accurate because preferred channel marks, which can be either a cone or a pillar shape, are designed to guide vessels through a channel by indicating the preferred side of the channel for navigation. These buoys typically display color combinations and patterns (such as green and red) to convey their meaning, but they do not specifically use white retroreflective material.

In contrast, safe water marks, isolated danger marks, and daymarks of no lateral significance usually include some form of white retroreflective material to enhance visibility during low light conditions. Safe water marks signify that there is navigable water all around, isolated danger marks indicate hazards that must be avoided, and daymarks of no lateral significance are simply used as navigational aids without indicating a specific lateral boundary.

Each type of buoy has its own distinctive design and use, reflecting its specific navigational message. Understanding these differences is crucial for safe navigation and compliance with navigational practices.