You bet! Start with the Buttons tab on the left of your dashboard, then click 'Existing Buttons' and 'edit' to the right of the button you would like to add a multiple choice field to.

Scroll down to the Visitor Fields section and click to add a new field; select the multiple choice field on the right. You now have a field to edit with your primary question and the multiple choice options that visitors can select during check in:

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