States not changing on multiple choice question

I have a multiple choice question that I have added an image on the hover and selected states, but it is not showing up in either case.  I tried deleting and re-adding the states but that is not working either. Is there something I am doing wrong? Basically I want an image of the answer choice to appear on screen when the moves hovers over the radio button (different picture for each button), but also want it to appear(and stay visible) when the user selects their answer. I have tried doing it with layers and triggers as well but nothing seems to work properly. Any suggestions?

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