hiding user choices with layers

Hi all,

I have hit another knowledge gap! I am creating interactivity on a slide, and the user clicks on one of the chevrons to lodge an answer. When they click, a black box appears which is sitting on another layer (picture below).

I want to be able to lock the chevrons, so that if a user changes there mind, and makes an alternative selection, the orignal choice is no longer displayed. However because I have 9 different layers (3 on each graph section) I can't use the hide other layers feature...

Would appreciate any ideas!!

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