Adding sound to buttons causes then not to work.

Question

I have a flash project with 3 buttons in each frame 1 button is the correct answer and two are not
here is the code
import flash.events.Event;
btnA.addEventListener(MouseEvent.CLICK, checkCorrectness);
btnB.addEventListener(MouseEvent.CLICK, checkCorrectness);
btnC.addEventListener(MouseEvent.CLICK, checkCorrectness);
function checkCorrectness(e: Event): void {
  if (e.target == btnA) {
  if (correctA) {
  totalscore++;
  } else if (e.target == btnB) {
  if (correctB) {
  totalscore++;
  } else if (e.target == btnC) {
  if (correctC) {
  totalscore++;
  score.text = totalscore;
  if (totalscore == 18) {
  gotoAndStop(21);
  return;
  nextFrame();
stop();
var totalscore = 0;
var correctA:Boolean = false;
var correctB:Boolean = false;
var correctC:Boolean = false;
score.text=totalscore;
each frame has this code below with the correct answer changing from frame to frame
correctA = true;
correctB = false;
correctC = false;
all works fine but now I have to use sound in the buttons so I duplicated a button and changed the name of one button to "true" and the original I changed to "false".
I added  in each of the two new button names a sound effect ( sound 1 for button true and sound 2 for button false)
So the frame list looks like this
frame 1
correctA = true;
correctB = false;
correctC = false;
button name 1 true instance name btnA
button name  2 false instance name btnB
button name 3 false instance name btnC
frame 2
correctA = false;
correctB = true;
correctC = false;
button name 1 false instance name btnA
button name 2 true instance name btnB
button name 3 false instance name btnC
according to this each correct button would trigger sound1 telly the score and move to the next frame
and each incorrect button would also tally the score and move to the next frame.
Not all selections are making the frame move nor the score tally.
any help.
ALL OF THIS WORK FINE WITHOUT THE SOUND AND THE BUTON NAMES CHANGED. SO THE RESULT IS I ONLY HAVE A WORKING FILE BUT WITHOUT THE SOUNDS FOR EACH BUTTON.
R

Answer 1

Great works like a charm, one thing though. Every time I click the Incorrect button button I hear that audio twice . I checked the actual mp3 and it just one sound.
Heres the code you gave me
var correctSound:CorrectSound=new CorrectSound();  // assign this class
var incorrectSound:IncorrectSound=new IncorrectSound();  "  "
function checkCorrectness(e: Event): void {
  if (e.target == btnA) {
  if (correctA) {
  totalscore++;
soundF(true);
  }else{
soundF(false);
  } else if (e.target == btnB) {
  if (correctB) {
  totalscore++;
soundF(true);
  }else{
soundF(false);
  } else if (e.target == btnC) {
  if (correctC) {
  totalscore++;
soundF(true);
  }else{
soundF(false);
  score.text = totalscore;
  if (totalscore == 18) {
  gotoAndStop(21);
  return;
  nextFrame();
function soundF(b:Boolean):void{
if(b){
correctSound.play();
} else {
incorrectSound.play();