Explanation: Digital Selective Calling (DSC) utilizes specific, internationally designated frequencies for maritime distress, urgency, safety, and routine calling. These frequencies are an integral part of the Global Maritime Distress and Safety System (GMDSS). The correct list of assigned DSC frequencies is: * **2187.5 kHz:** The primary medium frequency (MF) DSC distress and safety calling frequency. * **4207.5 kHz, 6312 kHz, 8414.5 kHz, 12577 kHz, 16804.5 kHz:** These are the high frequency (HF) DSC distress and safety calling frequencies across different bands. Option B accurately lists these precise frequencies. The other options include frequencies that are either for voice communications (e.g., 2182 kHz is the international voice distress frequency, not DSC) or other maritime calling frequencies not designated for DSC.