You may want to use the nth-child selector
$('ul li:nth-child(3) a').click() //something like that
$('ul li:nth-child(3) a').trigger('click');
That's it!
Use the nth-child selector. And put your code in a jQuery ready
event listener. Try this:
$(document).ready(function(){
$('ul.options_inner li:nth-child(3) a').trigger('click');
});