BOTH INTERNATIONAL & INLAND A man aboard a vessel is signaling by raising and lowering his outstretched arms to each side. What does this indicate?

Correct Answer: Option C — A distress signal

Annex IV, paragraph 1(m) explicitly lists the slow, repeated raising and lowering of arms outstretched to each side as a recognized distress signal. This visual signal is designed to be easily identified by other vessels or aircraft to indicate that assistance is urgently required.