Remove option in select

Answer 1

If you need to sort something, consider using something like jQuery UI sortable as a bunch of drop down menus make a really poor UX for that.

But to answer your question:

var $selects = $('.one');
$selects.on("keyup click change", function(e) {
  $selects.not(this).trigger('updateselection');
}).on("updateselection", function(e, data) {
  var $this = $(this);
  $this.children().show();
  $selects.not(this).each(function() {
    var value = $(this).val();
    if (value) {
      $this.children('[value="' + value + '"]').hide();
    }
  });
});