Setting a trigger or action that will remove the selected answers in a Knowledge Check for the second attempt

Hi all, I'm wondering if there is a recommended trigger to tie to a 'Try again' button that can clear prior selections in a multiple selection knowledge check leading into a second attempt. 

Currently, the prior attempt's selections aren't clearing at the beginning of the second attempt.  The system allows the user to deselect the prior answers, but not clear the prior attempt answer selections completely as one-action.  Is there a best-practice around setting this up?  Thanks. 

Marc

 

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