$(document).ready(function() {    
 
// Identify the questions -- FOR DISC
  var thisQuestion = $('[id^=question]');
  // Listener on the radios
  $('input.radio', thisQuestion).on('click', function(e) {
    $('input[type="radio"]', thisQuestion).prop('disabled', false);
    $('input.radio:checked', thisQuestion).each(function(i) {
      $(this).closest('tr.answers-list').find('input[type="radio"]').not(this).prop('disabled', true);
    });
  });
 
   // Initial settings
  $('input.radio:checked', thisQuestion).each(function(i) {
    $(this).closest('tr.answers-list').find('input[type="radio"]').not(this).prop('disabled', true);
  });
});

<script type="text/javascript" charset="utf-8">
  function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
      var j = Math.floor(Math.random() * (i + 1));
      var temp = array[i];
      array[i] = array[j];
      array[j] = temp;
    }
    return array;
  }
 
  $(document).on('ready pjax:complete',function() {
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    var elements = $('tr.answers-list', thisQuestion).detach().toArray();
    shuffleArray(elements);
    $('tr.answers-list', thisQuestion).remove();
    $.each(elements, function(i, el) {
      $('table.subquestion-list tbody:eq(0)', thisQuestion).append(el);
    });
  });
</script>

var thisQuestion = $('.array-flexible-column:eq(0)');

<script type="text/javascript" charset="utf-8">
  function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
      var j = Math.floor(Math.random() * (i + 1));
      var temp = array[i];
      array[i] = array[j];
      array[j] = temp;
    }
    return array;
  }
 
  $(document).on('ready pjax:complete',function() {
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    var elements = $('tr.answers-list', thisQuestion).detach().toArray();
    shuffleArray(elements);
    $('tr.answers-list', thisQuestion).remove();
    $.each(elements, function(i, el) {
      $('table.subquestion-list tbody:eq(0)', thisQuestion).append(el);
    });
 
// The answer code to place in the last position
    var fixedCode = 'A4';
 
// Move the "fixed" row to the end
    $('table.subquestion-list tbody:eq(0), table.subquestions-list tbody:eq(0)', thisQuestion).append($('tr[id$="X'+{QID}+fixedCode +'"]'));
 
// Fix up the array row background colours
    $('table.subquestion-list tbody tr, table.subquestions-list tbody tr', thisQuestion).each(function(i){
      $(this).removeClass('array1 array2').addClass('array'+(2-(i%2)));
    });
  });
</script>

<script type="text/javascript" charset="utf-8">
  function shuffleArray(array) {
    for (var i = array.length - 1; i > 0; i--) {
      var j = Math.floor(Math.random() * (i + 1));
      var temp = array[i];
      array[i] = array[j];
      array[j] = temp;
    }
    return array;
  }
 
  $(document).on('ready pjax:complete',function() {
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    var elements = $('tr.answers-list', thisQuestion).detach().toArray();
    shuffleArray(elements);
    $('tr.answers-list', thisQuestion).remove();
    $.each(elements, function(i, el) {
      $('table.subquestion-list tbody:eq(0)', thisQuestion).append(el);
    });
 
    // The answer code to place in the last position
    var fixedCode = 'A4';
 
    // Move the "fixed" row to the end
    $('table.subquestion-list tbody:eq(0), table.subquestions-list tbody:eq(0)', thisQuestion).append($('tr[id="javatbd'+fixedCode +'"]'));
  });
</script>