How to get dropdown name in jquery

<select id="sel1">
    <option>A</option>
    <option>B</option>
    <option>C</option>
</select>
<select id="sel2">
    <option>A</option>
    <option>B</option>
    <option>C</option>
</select>
<select id="sel3">
    <option>A</option>
    <option>B</option>
    <option>C</option>
</select>
<script type="text/javascript">
    $(document).ready(function () {
        $("select").change(function () {
            var id = $(this).attr("id");
            alert (id);
        });
    });
</script>