Coaxial cable is a high-frequency transmission medium commonly used for cable television, internet, and long-distance communication. It typically offers a bandwidth range from a few kilohertz up to several hundred megahertz. The approximate frequency bandwidth of a standard coaxial cable used in communications is up to 750MHz. Actual usable bandwidth depends on cable type, length, and quality (e.g., RG-6, RG-59, etc.). Hence, Option C ( 750MHz ) is correct.