JSFiddle - React, Tailwind, and code Playground

HTML

<select id='getbusornew' style="font-size:14px;" >
    <option value='News'>
        BBC News
    </option>
    <option value='Business' >
        Business News
    </option>
</select>

CSS

.selected
{
    font-size:20px;
    color:red;
}

JavaScript

$("#getbusornew :selected").addClass("selected");
$("#getbusornew").change(function(){
    $(".selected").removeClass("selected");
    $("#getbusornew :selected").addClass("selected");
});