If there is a likelihood of ignorance in the respondents, a "don't know" category is appropriate.

Question

Quizplus · Accepted Answer

If there is a chance that respondents may not have the necessary knowledge or information to answer a question, providing a "don't know" or "no opinion" response option can be helpful in ensuring the validity and reliability of the results. This can also prevent respondents from guessing or providing inaccurate responses.

If There Is a Likelihood of Ignorance in the Respondents