Which of the following is a feature of the "Multiple Choice" question type?

The feature of the "Multiple Choice" question type that allows for the inclusion of an option for "Don't Know" enhances the flexibility and inclusivity of the survey. This option acknowledges that not all respondents may have an opinion or knowledge regarding certain topics, allowing them to express uncertainty without forcing them to select an answer they are not comfortable with. Including "Don't Know" can lead to more accurate data, as it prevents respondents from providing misleading or false information simply to complete the survey. This is particularly useful in research contexts where understanding the level of uncertainty or knowledge gaps is crucial to interpreting results accurately.

The other options highlight characteristics that do not define the "Multiple Choice" question type. For instance, stating that it allows only a single choice misrepresents its capability; it can actually allow for multiple selections depending on the configuration. Requiring a numeric input typically pertains to different question types designed for quantitative data. Finally, while participants can indeed write in their answers in an open-ended question or a "Text Entry" question, the traditional "Multiple Choice" format generally does not provide that option unless specifically configured to do so.