pop up edit tidak bisa menampilkan data select option

mau tanya gan ini kenapa ya select option tidak memunculkan data ketika klik button edit

ini kode untuk select option:

<select class="form-control" name="actype">
<option disabled selected>Choose</option>
<?php foreach($actype as $actype) {
  echo '<option value="'.$actype->activity_type_id.'">'.$actype->activity_type_name.'</option>';
  }
?></select>

untuk ajaxnya:

function edit(id)
{
    $.ajax({
        url : "<?php echo site_url('activity/edit/')?>" + id,
        type: "GET",
        dataType: "JSON",
        success: function(data)

        {
            $("[name='activity_detail_id']").val(data[0].activity_detail_id);
            $("[name='actype']").val(data[0].activity_type_id);
            $("[name='activity_name']").val(data[0].activity_name);
            $("[name='project']").val(data[0].project_id);
            $("[name='portion']").val(data[0].portion);
            $('#Modal').modal('show');
            $('.modal-title').text('Edit Activity');// show bootstrap modal when complete loaded
            console.log(JSON.stringify(data));



        },
        error: function (jqXHR, textStatus, errorThrown)
        {
            alert('Error get data from ajax');
        }
    });
}