To remove a possible answer from a multi-radio button form field, go to the relevant form.
Check whether the multi radio button answer that you want to remove has any sub-questions. If it has sub-questions, you must delete the sub-questions first. Note: if members have completed the form, you will be asked to confirm that you want to delete the question, and any data that had been entered will be deleted.
Once you have removed any sub-questions, left click on the multi-radio button field in the tree. Scroll down to the possible answers section, and click on the remove link.
Click here for information on how to create mult-radio button fields.