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What can be used to emit sound signals in foggy conditions?

  1. A whistle

  2. Any fog-signalling apparatus

  3. Clapping hands

  4. Shouting loudly

The correct answer is: Any fog-signalling apparatus

Foggy conditions greatly reduce visibility and can make it difficult for others to recognize your position. While all the other options may emit sound signals, none of them are specific to foggy conditions. A whistle or clapping hands may not produce a loud enough sound, and shouting loudly may not be audible or directed enough to alert others. Therefore, a fog-signalling apparatus, specifically designed for emitting sound signals in foggy conditions, is the most suitable and effective option.