JSFiddle - React, Tailwind, and code Playground

HTML

<select id="selectVendor">
 <option value="55" selected="selected">Company A</option>
 <option value="56">Company B</option>
 <option value="57">Company XYZCYK</option>
</select>

JavaScript

jQuery(function(){
    var randRange = $('#selectVendor option').size();
    var getThis = randomFromTo(0,randRange);
    alert( $('#selectVendor option').eq( getThis ).attr('value') );
});



function randomFromTo(from, to){
   return Math.floor(Math.random() * (to - from + 1) + from);
}