Output data from database with PHP into dropdown box

i have a form designed with bootstrap style and i want retrieve data from database into drop down list i tried this code but i get a list with no text.

    <div class="form-group"><label class="col-sm-2 control-label">Location</label>
    <div class="col-sm-8"><select class="form-control m-b" name=Location>
    <?php
    $mysqli = new mysqli( 'localhost', 'cshrnaf_user2', '=cXlIBsdMkdr', 'cshrnaf_mis_db' );
    /* check connection */
    if (mysqli_connect_errno())
    {
    printf("Connect failed: %sn", mysqli_connect_error());
    exit();
    }
    $query = "SELECT * FROM adhoc";
    $result = mysqli_query($mysqli,$query);
    while($rows = mysqli_fetch_assoc($result))
    {
    echo "<option value=" . $rows['Aim'] . "></option>";

    echo "<option value='{".$d['Aim']."}'>".$d['Aim']."</option>";
    }
?>