what interaction is best for this?

Hi Greg,

I know you've received the help you needed but I have another solution, just to give you the information. I would have potentially set up a multiple response question with many response options with one of them that says something like: 'None of these options are correct' so they can then choose as many options as they think are correct (all of the incorrect responses won't be checked in the correct column in the form view when you set the question up) or they can choose just that one correct response (which obviously would be checked on the form view). I would then set the question to just one attempt using the top ribbon. That way, when they submit their choice or choices it can then lead to the correct or incorrect feedback option - which would obviously have to be worded in the correct feedback option to say something like 'Correct - NONE of the of the options are right'. Also, I would find it quite confusing if I had to just click submit without having chosen any answer - that's a very unusual scenario when you're asking them to choose options in the text - so the multiple response question means they do get to choose answers.

I hope that makes some sort of sense?