Explanation: Inmarsat-C is a low-data-rate, store-and-forward satellite communication system designed for asynchronous data, not real-time voice. It operates by transmitting small data packets, making it highly efficient for services like text messaging, data reporting, and safety broadcasts. Telephone communications via VOIP (Voice over IP) require a continuous, sustained data stream and significantly higher bandwidth than Inmarsat-C can provide for intelligible speech. Its typical data rates are too low for satisfactory real-time voice transmission. Conversely, Inmarsat-C is specifically designed for and widely used for: * **B) Message transmission:** Sending and receiving text and data messages (e.g., email, SMS). * **C) Broadcast data:** Distributing data to groups, such as maritime safety information (SafetyNET) or commercial fleet data. * **D) Position reporting:** Transmitting small data packets containing location information from mobile units. These are all low-bandwidth, packet-based data services that align perfectly with Inmarsat-C's operational capabilities.