How are the audio input and output of a transceiver connected in a station configured to operate using FT8?

Answer: B. To the audio output and input of a computer running FT8 software

FT8 is a digital mode that a computer turns into audio tones. The radio's audio output and input connect to the audio output and input of a computer running FT8 software. The computer listens to received tones and sends tones back to the radio to transmit. No special converter box or website is needed.

Tip: FT8 = radio audio <-> computer sound card + FT8 software.