In the file
$MAGENTO_PATHapp/design/frontend/base/default/template/catalog/product/view/options/wrapper.phtml,
I see the following line of code:
<?php echo $this->getChildHtml('',true,true);?>
This is responsible for printing the product options on the product page. I want to understand and modify the html content that this line of code produces, but I can't seem to locate the view or controller relevant to it. For example, let's say I want to programmatically add the characters to the innerHTML of each option element in a drop down, which phtml, php or html file do I edit?