I need to reset, clear or deselect a group of radio buttons

I haven't been able to find the answer to this: I have a quiz-like animation that uses a group of radio buttons, I need the group to reset, clear or deselect the previous selection after submitting the answer on each question, is that possible?

Here is the code:

stop();

var messageBox:TextField = new TextField();

messageBox.text = "";

addChild(messageBox);

messageBox.textColor = 0xFF0000;

messageBox.width = 200;

messageBox.height =100;

messageBox.x = 450;

messageBox.y = 340;

var userAnswer:int;

var rbg:Object = rbA.group;

var finalScore:int;

btnCheck.addEventListener(MouseEvent.CLICK, nextBtn);

function nextBtn(evt:MouseEvent):void {

userAnswer = int(rbg.selectedData);

            if(userAnswer == 0) {messageBox.text = "PLEASE SELECT AN OPTION";

}else{

finalScore = finalScore + userAnswer;

messageBox.text = "";

nextFrame();

}

}

btnFinish.addEventListener(MouseEvent.CLICK, finishBtn);

function finishBtn (evt:MouseEvent):void {

userAnswer = int(rbg.selectedData);

if(userAnswer == 0) {messageBox.text = "PLEASE SELECT AN OPTION";

}else{

finalScore = finalScore + userAnswer;

if (finalScore > 13){ gotoAndStop(8);

}else if (finalScore > 9){ gotoAndStop(7);

}else if (finalScore > 4){ gotoAndStop(6);

}else {}

}

}

startOver.addEventListener(MouseEvent.CLICK, reStart);

function reStart(evt:MouseEvent):void {

gotoAndStop(1);

finalScore = 0;

}