What statement best describes the INMARSAT-B services?

The choice indicating that INMARSAT-B services provide voice at 16 kbps, fax at 14.4 kbps, and high-speed data at 64/54 kbps accurately captures the capabilities of INMARSAT-B. This service integrates voice, fax, and data transmission over satellite, offering a range of speeds that enable effective communication for various applications, including maritime and aviation needs. The specific bit rates illustrate the technology's ability to accommodate different types of transmissions, which is critical for operations requiring reliability and efficiency.

The inclusion of both voice and data transmission at varying speeds illustrates the versatility of INMARSAT-B services, making them suitable for multiple user requirements, from sending faxes to engaging in voice calls and high-speed data operations. While other options may reflect some aspects of satellite communication, they do not accurately represent the full range of services and the specified speeds provided by INMARSAT-B.