I would like to know if SurveySparrows offers the option of restricting two or more answers from being selected in a multiple choice question. For example, when selecting "Do not know" or "Refused to answer", selecting other answers should not be possible.
Welcome to the community
Here are a couple of options you might find helpful:
You have the option to enable the "None of the above" feature and customize its phrasing. This will act as a single-select option, preventing multiple answers from being selected.
You can also set limits for the number of options that can be selected. Under Selection Limits, you'll find options such as Unlimited, Exact number, and Range. To meet your needs, I suggest configuring the Range with minimum and maximum options.
I've included a screenshot that may assist you.
Let me know if you have any questions