Answer

C

Explanation

The question is asking about the characteristics of "can buoys" in the context of maritime navigation. "Can buoys" are a type of buoy used in the lateral system of buoyage in maritime navigation. The options given are:1. They are painted red: This option is incorrect. In the lateral system of buoyage, "can buoys" are painted green, not red. The red color is used for "bouy" buoys, which are the opposite in the system. 2. They have even numbers: This option is incorrect. In the lateral system of buoyage, "can buoys" are numbered with odd numbers. The even numbers are reserved for "bouy" buoys.3. They make good mooring buoys: This option is correct. "Can buoys" can indeed be used as mooring buoys. Mooring buoys are used to mark a mooring line, which is a rope or cable used to secure a boat to the water.4. They are cylindrical in shape: This option is incorrect. "Can buoys" are not necessarily cylindrical in shape. They can come in various shapes, including spherical and conical, depending on the specific design and the organization that installs the buoyage system.Therefore, the correct answer is option C, "They make good mooring buoys".