Answer:
b. makes it possible for radio stations to transmit real-time text-based information services as well as programming.
Step-by-step explanation:
HD radio is a technical term used in describing the high definition of radio. It is characterized by its ability to transmit digital information or in-band on the channel. It is a better option compared to AM or FM radio.
Hence, considering the available options, the correct answer, in this case, is that HD radio "makes it possible for radio stations to transmit real-time text-based information services as well as programming."