what interaction is best for this?

Hi Greg!  Welcome to the community.  We were all once "newbies" ourselves, so I enjoy helping a fellow traveler get up to speed with this amazing software.

So!  At first glance, it seems like your desired interaction could be accomplished by implementing one of Storyline's freeform question slides:  Pick One.  Once a Pick One slide is in place, it will present you with two views: Form View and Slide View. Within the Form View, you can designate how the interaction treats certain elements found on your slide. In the attached story file, I've inserted five radio buttons and assigned each of these to be a "choice" the learner can choose from. Because none of the choices will be "correct," I've avoided assigning one by leaving the circles in the Correct column blank/unfilled.

Moving back into the Slide view, I set up a couple of text boxes to hold my question and a graphic for visual interest. I also included a custom Submit button. I did this intentionally to avoid Storyline's built-in warning which shows when the learner presses the default Submit button (the checkmark) before making a selection. With the triggers I have in place, the Correct feedback layer will still show after this warning appears, but it's better to avoid seeing the warning all together. Utilizing a custom button allows us to bypass the warning and jump straight to the appropriate layer.

You'll notice I also inserted a hotspot behind all the other elements. There is a trigger set up that says, When the hotspot is clicked, any radio button that is selected will become normal (i.e., deselected). By default, radio button sets are set up so that once a button is selected, it cannot be "deselected," so this trigger allows a learner to change their mind before finally hitting Submit.

Hope that helps! And good luck in your future projects!