Which channels can be classified as working channels?

The correct identification of working channels hinges on the purpose these channels serve in maritime communication. In this case, channels 68, 69, 70, and 72 are recognized as working channels primarily used for ship-to-ship and ship-to-shore communication. These channels facilitate operational communications during activities at sea, such as coordinating movements, conducting safety briefings, and managing logistics.

Channel 16, commonly known as the distress and safety channel, is primarily used for emergency situations and initial distress calls. While it is critical to maritime communication, it does not serve as a working channel for routine operational communication. Additionally, channels like 14, 15, and 13 are designated for specific uses such as bridge-to-bridge communications but do not provide the same level of versatility for day-to-day working purposes, making option B more appropriate for this classification.

Thus, identifying the proper usage of each channel plays a vital role in ensuring effective communication and safety in maritime operations, which is why option B stands out as the correct choice regarding working channels.