Please set the none option to appear as the last concept then add this script to your CBC:
<script>
$(document).ready(function(){
$('#[% QuestionName() %]_div .cbc_concept.concept_1').before($('#[% QuestionName() %]_div .cbc_concept.none_concept'));
})
function SSI_SetBestConcept(question, conceptIndex) {
var conceptClass;
if (conceptIndex) {
conceptClass = '.concept_' + conceptIndex;
}
else {
conceptClass = '.concept_' + $('#[% QuestionName() %]_div .cbc_concept').length;
}
var concept = question.find(conceptClass);
if (concept.length) {
SSI_ClearBestConcept(question);
if (concept.is('.worst')) {
SSI_ClearWorstConcept(question);
}
concept.addClass('best');
SSI_SetBestResponseDot(question, conceptIndex);
}
}
</script>
Test thoroughly. Some changes may be necessary if using a best-worst or constant sum CBC.