FreeForm Pick One Feedback Layers won't progress!

Right Hero's, 

I'm at a loss with this issue. This should be a simple pick one quiz that displays a feedback layer (one of 4 options, assigns some points and then branch to Next Slide). 

For some reason, it's not working and I have no idea why?!

Help! I've attached the .story for any wiser wizards than I :) 

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