To add a Radio Button question, follow the steps for adding a question to a survey.

A Radio Button question provides multiple responses that can be selected via radio buttons, and only one option can be selected at a time.
Add more responses
If you require more than five responses, simply use the Add 5 more answers link.

Display Formatting
The format of the response selection depends on the number of answer options.

Remember to review the sections, visibility and formatting, N/A scoring, question scoring and question requirements knowledge base articles as needed!