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What do cautionary buoys warn mariners of?

  1. Good fishing spots

  2. Dangers such as firing ranges and underwater structures

  3. Party zones

  4. None, they are purely decorative

The correct answer is: Dangers such as firing ranges and underwater structures

Cautionary buoys are placed in bodies of water to warn mariners of potential dangers that may be present. These dangers can include firing ranges where active training or testing may be taking place, or underwater structures that may pose a hazard to boats or swimmers. While cautionary buoys serve a practical purpose, they are not used to mark party zones or to denote good fishing spots. They are also not decorative and should be taken seriously by mariners to ensure safe navigation.