Which of the following buoys will NOT display white retro-reflective material?

The choice indicating the day mark of no lateral significance is correct because this type of buoy is primarily intended to provide navigational information and does not serve a lateral marking function. Unlike other buoy types, which often display white retro-reflective material to enhance visibility at night and during poor weather conditions, day marks of no lateral significance are typically utilized for daytime navigation only. These marks usually support regulatory or informational signage and do not typically include reflective features, as their primary purpose is to convey information visually during daylight hours.

In contrast, safe water marks, isolated danger marks, and preferred channel marks all serve specific navigational functions that include the need for retro-reflective material, aiding in their recognition and visibility under various conditions. Thus, the nature and function of the day mark of no lateral significance justify its lack of white retro-reflective material.