Conditions needed when Selecting a Choice before Submitting

These triggers are the problem:

Once one of them is selected, it doesn't matter if a different one is selected, the first variable has been set. The objects on the slide are in a button set, so only one of them can be selected at a time, but there is no such protection for variables.

The solution is not to set the variables until the learner has made all the changes they are going to make, then set them according to the last choice.  Add a trigger like this to the submit button for each variable:

Be sure the trigger to set the variable is above the trigger to jump, or the variable won't be set.

Also, for what it is worth, I would make A, B, and C a button set and a create the same triggers for them. I know when I look at the slide, I want to click those pretty buttons, and not the dull explanations beside them.