Set question as correct or incorrect on results slide using variables

Thanks for the quick response, Andrew! Unfortunately, I'm still not having any luck figuring out how to actually impact the quiz score of the course. My result slide keeps reporting a score of 0%. 

I should add that one of the complicating factors is that I have draggable objects that can potentially cover the answer buttons on the base layer. I could bring the base layer to the front by "showing" it, but apparently, we can't "show" the base layer.