Question

   var myArray = [];
     $('#students_targeted option:selected,
#cc_students_targeted option:selected').each(function(){
       myArray.push(data);
     });

Answer 1

This means that you have reached maximum stack size (in other words you have reached maximum limit of elements in array).

UPD: You probably need to use this code:

   var myArray = [];
     $('#students_targeted option:selected,
#cc_students_targeted option:selected').each(function(){
       myArray.push($(this).val());
     });