Explanation: Coast stations using telephony are permitted to transmit a general call (e.g., an "all stations" call) when the information is critical and intended for all vessels within range. This primarily includes announcing or preceding transmissions of Distress, Urgency, or Safety messages, such as navigation warnings, meteorological alerts, or other vital information affecting maritime safety. This practice ensures that all potentially affected vessels receive crucial information. Option A is incorrect because general calls are indeed permitted under specific, important circumstances. Option C is incorrect; the 12-mile limit relates to territorial waters, but doesn't dictate the permissibility of a general call, which is based on the message's content. Option D is incorrect because for routine "identical traffic," specific calls to individual vessels or more targeted group calls are generally preferred to maintain efficient use of the airwaves, reserving general calls for universally important or urgent broadcasts.