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

A
Resume base course and speed as your assistance is no longer required.
B
Acknowledge receipt and advise your course, speed, and ETA.
C
Relay the original distress message as no other vessel has acknowledged it.
D
Monitor the radiotelephone but do not transmit.
E