What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
To limit your users to only one answer for multiple choices we recommend using the "radio button" field since you can list multiple answers but only one of them is allowed to be used.
Backend of the form in formbuilder:
Front-end of the form with one selection available:
As described by my colleague, "Radio button" is the best option to limit answer to only one selection in a multiple choice question. So please try it.
If you have any query, or need further assistance, feel free to revert back.