One way would be to save the responses in an array. I'm not sure how you are structuring your fla but on the few of these I've worked on we would create an array to hold the answers e.g.,
var answerArray:Array = new Array();
For a particular question selecting an option (A, B, or C) would set a variable that would be saved when the user clicked a button to move to the next question or to end the quiz. Something like:
Code:
btnNextQuestion.onPress = function(){
answerArray.[questionNumber] = currentSelection;
//questionNumber indicates which survey question you are on
//currentSelection holds "A","B", or "C"
}
When the quiz is over you can loop through the answerArray to list responses, calculate totals, etc.