From Audacity Development Manual
The exported WAV or AIFF file should be:
- 44100 Hz (set at Project Rate in Audio Settings Preferences).
- 16-bit (chosen using the "Save as type" menu in the File Export Dialog ).
These are Audacity's default settings, so normally you will not need to change these before exporting.
Burn the exported file to an "audio CD" - not a "data CD" or "MP3 CD" - with a CD burning application like Apple Music/iTunes or Windows Media Player.
For more help, see Burning music files to a CD.