JSFiddle - React, Tailwind, and code Playground

HTML

<select id="mySelectBox">
    <option> first</option>
    <option selected="selected"> second </option>
    <option> third </option>
</select>

JavaScript

$('#mySelectBox option').each(function() {
    if (this.selected)
       alert('this option is selected');
     else
       alert('this is not');
});