Toggle Between Choices - Need Help

Not sure what to do here, but I'm guess it involves a count variable in some fashion:

I've got two choices, A &B.  If the user selects choice A, the Selected state shows a red circle around the A. If B is selected, same thing happens.  However, if the user accidentally selects one of the responses and wants to change their answer, I want them to be able to do that.

This is not set up as a quiz or a test and I don't want it to be one.  I simply want users to be able to select one choice or the other and change their answer if they need to.  Thanks in advance!

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