In Rules, I don't see any option to deselect radio button items.
In my rule, I want an Action which is to deselect 'Request Resubmission', as in this screenprint.
There is none that I'm aware of.
Radio buttons aren't meant to be deselected (a single selection is required). I would suggest using checkboxes to deselect an option or add a "None" option to your radio group.