While proceeding towards a distress site you hear the message PRU-DONCE over the radiotelephone. Which action should you take?

A
Advise the sender of your course, speed, position, and ETA at the distress site.
B
Resume base course and speed because the distress is terminated.
C
Shift your radio guard to the working frequency that will be indicated in the message.
D
Use that frequency only for restricted working communications.
E