Which signaling method uses flags or flares?

• A. Sound signals.
• B. Radio communications.
• C. Visual signals.
• D. Morse code.

Answer: (C)

Visual signals communicate by sight, using flags and pyrotechnic signals like flares. Flags convey messages through a standardized code (ships hoist flags in sequences to spell words or indicate status), while flares provide bright, attention-grabbing signals that can be seen from long distances, especially at night or in poor visibility. This method relies on line-of-sight observation, so clear visibility is essential. Sound signals require hearing, radio relies on electromagnetic transmission, and Morse code is a coding method that can be transmitted by light or sound, not inherently tied to flags or flares.