While proceeding to a distress site, you hear the words "Seelonce mayday" on the radiotelephone. Which action should you take?

Correct Answer: Option B — Monitor the radiotelephone but do not transmit.

Hearing "Seelonce mayday" imposes strict radio silence on that frequency. Responding vessels must maintain radio silence, monitor closely, and refrain from transmitting unless directed by the on-scene coordinator.