Resetting Quiz Answers

Hi!

I created a drag and drop activity/quiz question where the user can retry with unlimited attempts until they get it right (answers populate one at a time from the start area).  However, if they get it wrong and retry the question the answers stay in drop target (second picture) instead of returning to the orignal format (first picture), when I would like them to reset.  Is there a way to reset the answers if they get it wrong?

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Thank you!