To require respondents to select a minimum number of options or to set a cap on the maximum selectable options for a question:
- Edit your question.
 - Go to the Validation tab.
 - Enter the maximum number of options you would like to have selected in the Limit answers to field and/or enter the minimum number of answers in the If answered, minimum answers required field (you can set both a min and a max value).
 - Save the question.
 
Minimum-Answers-Required Compatibility
If answered, minimum answers required is available for the following questions:
- Textbox List
 - Checkboxes
 - Image Select (multi)
 - Dropdown Menu List
 - Ranking Grid
 - Drag & Drop Ranking
 - Continuous Sum
 - Star Rating Grid
 - Radio Button Grid
 - Checkbox Grid
 - Dropdown Menu Grid
 - Textbox Grid
 
Limit-Answers Compatibility
Limit Answers to is available for the following questions: