How to de-select a radio button?

When I click on a radio button choice, there is no way to de-select the choice once I click on it. 

Unfortunately there in no possibility to de-select radio button. But you can make some workarounds.

First one is to use check boxes instead of radio buttons because check boxes can be de-selected.

Second is that you can add Reset Form button. Reset button will reset all selection on your form. 

Let us know if you need further assistance.