<!DOCTYPE html>
<html>
<head>
<title>Title of the Document</title>
<script src="https://code.jquery.com/jquery-3.5.0.min.js"></script>
</head>
<body>
<select id="selBooks" name="books" style="font:14px Verdana;">
<option value="html">HTML Book</option>
<option value="git">Git Book</option>
<option value="javascript">JavaScript Book</option>
<option value="css">CSS Book</option>
</select>
<input type="submit" id="submit" value="Remove All" />
<script>
$(document).ready(function() {
$("#submit").click(function() {
$('#selBooks').find('option').remove();
});
});
</script>
</body>
</html>