Which would indicate a malfunction in a 2182 kHz radiotelephone system?

Correct Answer: Option B — Failure to contact another station 60 miles distant during daytime operation.

Failure to establish contact at 60 nautical miles on 2182 kHz during the day indicates a significant degradation in transmitter power or antenna efficiency. Given the propagation characteristics of the MF band, this range should be easily achievable, and such a failure constitutes a reportable GMDSS station malfunction.