Last Option In Array (Numbers) (Checkboxes) Row Excludes All Others

// A jQuery plugin to render column(s) in checkbox arrays exclusive
(function( $ ){
 
	$.fn.cbExclusiveColumns = function(options) {  
 
		var opts = $.extend( {
			//columns: [3,4] // Column(s) to be exclusive (comma-separated) 
		}, options);
 
		return this.each(function() { 
 
			var thisQuestion = $(this)
 
			// Add some classes to the checkbox cells
			$('td.answer-item', thisQuestion).addClass('normal-item');
			$('tr.subquestion-list', thisQuestion).each(function(i) {
				var thisRow = $(this);
				$.each(opts.columns, function(i, val) {
					$('td.answer-item:eq('+(val-1)+')', thisRow).removeClass('normal-item').addClass('exclusive-item');
				});
			});
 
			// A listener on the checkboxes
			$('input[type="checkbox"]', thisQuestion).on('change', function (event) {
				handleExclusive($(this).closest('td'));
			});
 
			function handleExclusive(thisCell) {
 
				var thisRow = $(thisCell).closest('tr');
 
				// Uncheck the appropriate boxes in a row
				if ($(thisCell).hasClass('normal-item')) {
					$('.exclusive-item input[type="checkbox"]', thisRow).prop('checked', false);
					$('.exclusive-item input[type="text"]', thisRow).val('');
				}
				else {
					$('.answer-item', thisRow).not(thisCell).find('input[type="checkbox"]').prop('checked', false);
					$('.answer-item', thisRow).not(thisCell).find('input[type="text"]').val('');
				}
 
				// Check conditions (relevance)
				$('td.answer-item', thisRow).each(function(i) {
					var thisValue = '';
					if($('input[type="checkbox"]', this).is(':checked')) {
						thisValue = 1;
					}
					var thisSGQA = $('input[type="checkbox"]', this).attr('id').replace(/cbox_/, '');
 
					$('input[type="hidden"]', this).attr('value', thisValue);
					fixnum_checkconditions(thisValue, thisSGQA, 'hidden');
				});
			}
		});
 
	};
})( jQuery );

<script type="text/javascript" charset="utf-8">
	$(document).on('ready pjax:scriptcomplete',function(){
		$('#question{QID}').cbExclusiveColumns({
			columns: [3,4] // Column(s) to be exclusive (comma-separated)
		});
	});
</script>