Get value of a dropdown field

The code 

$(document).on('knack-page-render.scene_35', function(event, page) {

  alert( $('#view_48 #field_172').val() );


works if field_172 is a text field but returns "undefined" if it is a multiple choice.

I trying to disable fields in my EDIT form (view 48) if the value of the "STATUS" field (field_172) is not "Not Submitted".

I can not even seem to get the value of field 172,