根据JQuery中的下拉列表中选择的选项禁用和启用单选按钮

I have a radio button option i want to disable and enable based on an option selected from a drop down list. I have the radio button option originally disabled but when I attempt to enable it based on the option selected in the drop down list nothing happens. could i get some help with this: HTML:I have a radio button option i want to disable