How to limit only one option on a multiple question?

How do you limit it so a person can only click one of the choices on a multiple choice question. I thought it was automatic when you choose a single choice question rather than multiple choice. 

Hi,

The 'Single Choice' widget should do the trick on selecting a single answer or option on a multiple-choice question. On your form builder, please verify if the widget is the single choice element.

You can refer to this link with the different functions of the widgets and fields on the form builder.

I hope that helps.

As suggested by my colleague the radio option has the default option to choose only one option.

However, in the Multiple Choice you can also limit entries to 1 as shown below:

Result:

If you select multiple option and click on submit, a validation message would be shown:

Let us know if you have further questions.

Thanks.