Which of the following conditions would be a symptom of malfunction in a 2182 kHz radiotelephone system which must be reported to an onboard or at-sea maintainer under GMDSS?

Correct Answer: Option B — No indication of power output when speaking into the microphone.

Lack of power output when speaking into the microphone indicates a failure in the modulation or final amplifier stage of the transmitter. Under GMDSS maintenance requirements, this is a critical malfunction that renders the station incapable of distress communication, requiring immediate attention by a qualified radio technician.