You are using VHF channel 16 (156.8 MHz) or 2182 kHz. You need help but are not in danger. You should use the urgent signal __________.

Correct Answer: Option C — "PAN-PAN"

The urgent signal "PAN-PAN" (spoken three times) indicates a very urgent message concerning the safety of a vessel or person, distinct from "MAYDAY" which denotes grave and imminent danger requiring immediate assistance under maritime radio protocols.