Remove option in select

Answer 1

It will be easy if you use different class for second and third select element

$(".one").change(function(){
    var val = parseInt($(this).val());
    $('.two,.three').find('option:contains('+val+')').remove();  
});  

EDIT:
Updated code to apply for multiple selects. [Thanks to all commentators and Alex for bringing it to notice ]

  $(".one").change(function(){
        var val = parseInt($(this).val());
        $(this).siblings().find('option:contains('+val+')').remove();  
    });