JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-latest.js"></script>
<body>
<select>
<option id="mylar2"> 1 mylar</option>
<option> 2 mylar</option>
<option> 3 mylar</option>
</select>
    
<select id="mylar1">
<option>Birthday</option>
<option>Love</option>
<option>Get Well</option>
</select>
</body>

JavaScript

$(document).ready(function(){
    $( "#mylar1" ).change(function() {

var mylarOcc = $( "#mylar1" ).val();
var mylarNum = $( "#mylar2" ).val();

        $( "#mylar2" ).text(mylarOcc + " " + mylarNum);
});
});