Hello Janet,
Thanks for reaching out!
Sounds like you have questions about making a Storyline 360 course accessible. You can check out this article for tips on designing accessible courses to help you get started.
They include steps to make audio files accessible and how to make the course accessible to keyboard users.
For the second item, I made a quick recording of what's I'm seeing on my end when I tab through the choices. I didn't encounter the behavior where I had to return to the first option to set the state of the choice to the Selected state. Would you mind making a quick Peek 360 recording of what you're seeing so I can test your experience more accurately?